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公开(公告)号：JPH03179410A
公开(公告)日：1991-08-05
申请号：JP31997689
申请日：1989-12-08
Applicant: CANON KK
Inventor： HAYAKAWA SHINGO , SUDA YASUO , KOYAMA TAKASHI
Abstract: PURPOSE:To project a pattern on the entire area of the principal part of a photographic picture plane and to enable highly accurate focus detection at many points in the photographic picture plane by specifying the pattern of a light emission part and the constitution of a lighting system and a projection means. CONSTITUTION:The specific pattern 2 is projected on a subject side by the projection means 1 and its reflected pattern image is photodetected by a photodetection system to detect the focus of a photography system. Then the projection means has (n) lens parts 11 - 14 which are arranged having their optical axes on the same plane and are nearly equal in refractive index and 0.36
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公开(公告)号：JPH03166538A
公开(公告)日：1991-07-18
申请号：JP30537789
申请日：1989-11-25
Applicant: CANON KK
Inventor： KITAGISHI NOZOMI , OIZUMI KOJI , KOYAMA TAKASHI
Abstract: PURPOSE:To miniaturize a camera and to improve portability thereof by integrally moving a lens system to an image surface side from the state of the almost telephoto end of a zoom lens in the case of switching to a telescope state from a photographing state and changing the focal distance of an ocular to a short side. CONSTITUTION:At the time of obtaining the telescope state, a space is formed between a 2nd lens group and a 1st mirror on the telephoto side in the two- group zooming. In the telescope state, the image 11 is moved near to the ocular 7 by integrally feeding the 1st lens group 1-1 and the 2nd lens group 1-2 of a photographing lens 1 toward the 1st mirror from the state of the telephoto end by the use of the space. Then, an auxiliary lens 10 having positive power is inserted in the optical axis of the ocular 7 by a driving means so that the diopter of an eye may be fitted to the image 11 and the focal distance of the ocular is adjusted to be short, so that the telescope is constituted. Thus, the compact camera provided with a telescope which is excellent in portability is obtained.
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公开(公告)号：JPH03122655A
公开(公告)日：1991-05-24
申请号：JP25998089
申请日：1989-10-06
Applicant: CANON KK
Inventor： ANAYAMA HIDEKI , KOYAMA TAKASHI , HASHIMOTO YUICHI
IPC: G03G5/14
Abstract: PURPOSE:To obtain potential characteristics stable against all the environments ranging from high temperature and high humidity to low temperature and low humidity and a good image by incorporative polyamide grafted with homo- or co-polymers each having a specified unit component in an interlayer. CONSTITUTION:The interlayer contains the polyamide grafted with the homopolymers or copolymers each having the unit component represented by formula I in which R1 is H or methyl; Z is -O- or -NH-; R2 is H, alkyl, or aryl; A is alkylene; and (n) is an integer of 1 - 100. As the polyamide constitut ing the main chain of the grafted polyamide, various nylons are enumerated as follows; nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon copolymers of the some component units of these nylons, N-alkoxymethylated nylon, N- alkylated nylon, nylons having aromatic units or the like, thus permitting poten tial characteristics stable against all the environments ranging from high temper ature and high humidity to low temperature and low humidity and a good image to be obtained.
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公开(公告)号：JPH0378715A
公开(公告)日：1991-04-03
申请号：JP21571789
申请日：1989-08-22
Applicant: CANON KK
Inventor： KOYAMA TAKASHI
Abstract: PURPOSE:To allow the multipoint distance measurement over the entire part of an image plane with high accuracy by providing a condenser lens face and a deflecting means consisting of plural divided deflecting planes which deflect a part of the luminous flux transmitted through the lens face in plural directions forming the prescribed angle from the optical axis of an optical system. CONSTITUTION:The rear face of the deflecting means 22 has the plural divided deflecting planes 22b to 22d which deflect a part of the luminous flux from the photodetecting lens 21 in the plural directions forming the prescribed angle from the optical axis L. The deflecting plane 22b among these faces constitutes the coaxial system having the optical axis L with the 1st lens face 22a of the deflecting means 22 and the shape of this lens face is approximately concentric around the central part of the photodetector 23. The deflecting planes 22c, 22d constitute the concave lens faces having a deflecting effect and respectively have the optical axes L22c, L22d. The multipoint measurement with the high accuracy is execute at the plural points in a photographing range while the luminous flux is effectively utilized by one light source or one photodetector.
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公开(公告)号：JPH0362041A
公开(公告)日：1991-03-18
申请号：JP19858489
申请日：1989-07-31
Applicant: CANON KK
Inventor： ANAYAMA HIDEKI , KOYAMA TAKASHI , HASHIMOTO YUICHI
IPC: G03G5/14
Abstract: PURPOSE:To obtain stable potential characteristics and images under all the environments by incorporating a specified grafted polyamide resin in an interlayer. CONSTITUTION:The interlayer contains the polyamide resin 6 grafted by the polymer or copolymer having the structural units each represented by formula I in which R1 is H or methyl, and A is a cation, and (p) is an integer. The interlayer may be made of only the polyamide resin, but when needed, it may contain another resin and an additive in addition, thus permitting the photosensitive body to stabilize potential characteristics under all the environments from low temperature and low humidity to high temperature and high humidity and to form superior images free from fog and defects, such as black spots.
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Patent Agency Ranking
公开(公告)号：JPH0341408A
公开(公告)日：1991-02-21
申请号：JP17646889
申请日：1989-07-07
Applicant: CANON KK
Inventor： OTAKA KEIJI , KOYAMA TAKASHI , SUDA YASUO
Abstract: PURPOSE:To miniaturize a whole device while enabling range finding operation in plural areas in a photographying range by setting respective optical elements from a secondary optical means to a light receiving means properly by providing an optical member made of a transparent medium on the optical path, etc. CONSTITUTION:At least two 1st and 2nd focus detection systems are arranged on the image plane side of an objective and the device is provided with the secondary optical system 34 which forms plural light quantity distributions regarding an object image by using luminous flux passing through different areas of the pupil of the objective, a diaphragm 33 which limits the quantity of light incident on the secondary optical system, and a photodetector string 35. The 1st and 2nd focus detection systems have mutually different center parts of range finding visual fields in light quantity distribution areas of the object image to be detected. Namely, the secondary optical system 34 composed of eight image forming lenses (34-1a)-(34-1d), (34-2a)-(34-2b), and (34-3a)-(34-3b) on the whole and they are arranged behind respective aperture parts of the diaphragm 33 corresponding to them. Further, the optical member 49 made of the transparent medium is charged in the optical path extending from the secondary optical system 34 to the light receiving means 35 to adjust the optical path length.
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公开(公告)号：JPH0338663A
公开(公告)日：1991-02-19
申请号：JP17322589
申请日：1989-07-05
Applicant: CANON KK
Inventor： HASHIMOTO YUICHI , KOYAMA TAKASHI
Abstract: PURPOSE:To obtain high-quality images which obviate the generation of dotty fogging by nonuniform electrification and the image defects, etc., by the discharge insulation breakdown of a photosensitive body by using the electrifying member for electrophotography having a surface layer contg. a specific polyurethane resin. CONSTITUTION:The electrifying member 1 is formed by successively forming a base layer 3 and a surface layer 4 on a conductive base body 2. The surface layer 4 contains the polyurethane resin having 1.0
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公开(公告)号：JPH0337607A
公开(公告)日：1991-02-19
申请号：JP17279589
申请日：1989-07-04
Applicant: CANON KK
Inventor： KOYAMA TAKASHI , OTAKA KEIJI
Abstract: PURPOSE:To eliminate restriction by a sub mirror and to vary focus detecting visual field by providing a means for forming a signal showing the focusing state of an objective lens based on the signal of a spot corresponding to the extent of detecting visual field of a photoelectric conversion element. CONSTITUTION:A plate 14 is held so that it can freely move in a direction shown by an arrow in a figure and is moved in an inplane direction by the actuation of an actuator 21 based on the input by an input means 20, which is intended to vary the extent of range-finding visual field. A field lens 10' is a fixed one having a Fresnel surface on its one side and the plate 14 is arranged nearer to a pentagonal prism side than the lens 10'. A detection mark is formed on the one side of the plate 14, which is held so that it can feely move in the in-plane direction (direction perpendicular to an optical axis). As for the focus detection, secondary image-formation is executed on the photoelectric conversion elements 6' and 7' respectively by the use of secondary image-formation lenses 4 and 5 with luminous fluxes passing through the different parts in the pupil of the objective lens 1, and the focus is detected in accordance with a distance between the images. Thus, the detection extent is set at a desirable position without causing a trouble that a camera is made large in size because the sub mirror is made large.
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公开(公告)号：JPH0311360A
公开(公告)日：1991-01-18
申请号：JP14621989
申请日：1989-06-08
Applicant: CANON KK
Inventor： HASHIMOTO YUICHI , KOYAMA TAKASHI
IPC: G03G5/14
Abstract: PURPOSE:To prevent the degradation in a barrier function at and under a high temp. and high humidity and the degradation in dark part potential by providing an intermediate layer contg. polyol compds. different in weight average mol. wt. CONSTITUTION:The intermediate layer 2 contains the polymer of an isocyanate compd. and the polyether polyol compds. consisting of the plural components different in the weight average mol. wt. The photosensitive layer may be a laminated structure type separated in function to a charge generating layer 3 and a charge transfer layer 4 or may be a single layer 5 contg. the charge generating material and the charge transfer material in the same layer. The polyol compds. contain the polyol components of the different weight average mol. wt. at the time of forming polyurethane, by which the increase in resistance at and under a low temp. and low humidity is suppressed as compared to the case of using the single polyol compd. The formation of the smooth coating film on a substrate is thus possible. The degradation in the dark part potential at and under the high temp. and high humidity is lessened and the photosensitive body having a sufficient barrier function as the intermediate layer is obtd.
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公开(公告)号：JPH02253223A
公开(公告)日：1990-10-12
申请号：JP7625989
申请日：1989-03-28
Applicant: CANON KK
Inventor： KOYAMA TAKASHI , OTAKA KEIJI
Abstract: PURPOSE:To prevent a shadow in a range-finding visual field from being caused at the time of observing by means of a finder and to detect a focus with high accuracy by specifying the optical arrangement of each element concerning a focus detecting means in an image deviation system and using a luminous flux passing through the primary image-formation surface of a finder system so that the focus may be detected. CONSTITUTION:The arrangement of each element of the focus detecting means is set to satisfy a formula (1), so that the luminous flux between the luminous fluxes m1 and m2 exiting from finder visual field ends 10b and 10c is effectively prevented from being made incident on other photodetector train 5-2 as unnecessary light by jumping over the optical axis L of a focus detection system after passing through a secondary lens 4-1 and having an adverse effect there. Provided that the image-forming magnification of a secondary optical system is taken as beta, a distance from the primary image-formation surface to the principal point on a front side of the secondary optical system is taken as X, the angle of a principal light beam from each center of the secondary optical system to the center of the viewing angle of the primary image-formation surface is taken as theta, the length of range-finding visual field on the primary image-formation surface is taken as (l) and the image height in the longitudinal direction of a photodetector train by the secondary optical system on the finder visual field end is taken as (h).
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