中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

284 records (took 0.025 seconds)

    FINDER SYSTEM
    25.
    发明专利
    FINDER SYSTEM 失效

    公开(公告)号：JPH08122853A

    公开(公告)日：1996-05-17

    申请号：JP28446294

    申请日：1994-10-24

    Applicant: CANON KK

    Inventor： MURATA YASUNORI ,  KOYAMA TAKASHI

    IPC: G03B13/02 ,  G03B13/06

    Abstract: PURPOSE: To effectively stop harmful ghost light or flare light and to ensure observation of a good finder image by suitably determining the shape of an aperture of a diaphragm, which is installed in an objective lens. CONSTITUTION: An object image, which is formed on a primary image forming plane by means of an object lens L0, is reversed into a normal, erecting image by means of an image reversing optical member LP. Then, observation of an object image (finder image) of the normal, erecting image is carried out via an ocular lens LE at a pupil position (Q). Now, let the direction of an optical axis be a Z-axis, so that X-, Y-axes are set in a plane perpendicular to the Z-axis. Roof-edge line (D) of a roof-reflecting surface P2C is situated within the X-Z plane. The shape of an opening part of a diaphragm (S) consists of repeated, continuous (or discontinuous) waveform, comb-form, or a saw-tooth form, which lies in the X-Y plane and is symmetrical with respect to the X-axis. With this contrivance, harmful stray light can be stopped, and, even if the pupil position for the observation is moved in the vertical direction, the roof- edge line is not observed, thereby enabling the observation of a good finder image.

    MULTIPOINT RANGE-FINDING DEVICE
    26.
    发明专利
    MULTIPOINT RANGE-FINDING DEVICE 失效

    公开(公告)号：JPH08101338A

    公开(公告)日：1996-04-16

    申请号：JP25941294

    申请日：1994-09-29

    Applicant: CANON KK

    Inventor： KOYAMA TAKASHI

    IPC: G01C3/06 ,  G01C3/08 ,  G02B7/30 ,  G03B13/36

    Abstract: PURPOSE: To enable a first photodetector system and a second photodetector system to accurately execute a multipoint range-finding action within an extremely wide viewing angle on an object side by using a short photoelectric conversion element array by making element lenses respectively constituting compound-eye lenses form the images of the mutually separated parts of the object corresponding to the element lenses on the object on photoelectric conversion elements. CONSTITUTION: By the element lens constituted of surfaces 2a and 2g (surfaces 2d and 2h), the image of one peripheral part A of the object is formed on the photoelectric conversion element 4a(4b). By the element lens constituted of a surface 2b and the surface 2g(surfaces 2e and 2h), the image of the central part B of the object is formed on the element 4a(4b). By the element lens constituted of a surface 2c and the surface 2b(surfaces 2f and 2h), the image of the other peripheral part C is formed on the element 4a(4b). Then, the first photodetector system 100a constituted of the compound- eye lens 20a, mirrors 3a and 3b and the photoelectric conversion element array 4a and the second photodetector system 100b constituted of the compound-eye lens 20b, mirrors 3c and 3d and the photoelectric conversion element array 4b are arranged at the interval of base length L.

    DISTANCE MEASURING DEVICE
    27.
    发明专利
    DISTANCE MEASURING DEVICE 失效

    公开(公告)号：JPH0814886A

    公开(公告)日：1996-01-19

    申请号：JP14453094

    申请日：1994-06-27

    Applicant: CANON KK

    Inventor： KOYAMA TAKASHI

    IPC: G01C3/06 ,  G02B7/32 ,  G03B13/36

    Abstract: PURPOSE:To provide a compact multi-point distance measuring device which prevents the degree of distance measuring accuracy from lowering even for a wide viewing angle. CONSTITUTION:In a multi-point distance measuring device, a light projecting system and a light receiving system are arranged in a base line direction, light emitting parts 2a to 2e in the light projecting system cast a plurality of light beams toward an object to be distance-measured, along the base line direction, and light beams reflected from the object to be distance-measured are received by the light receiving system so as to measure a distance to the object to be distance-measured. The light receiving system comprises a light receiving lens 4, a light receiving element having light receiving parts 4a to 4d receiving light beams having passed through the light receiving lens, and a reflecting member 3 for reflecting a spot beam from the light emitting part 2a toward the light receiving part 4a.

    MULTI-POINT DISTANCE MEASURING APPARATUS
    28.
    发明专利
    MULTI-POINT DISTANCE MEASURING APPARATUS 失效

    公开(公告)号：JPH07280550A

    公开(公告)日：1995-10-27

    申请号：JP6597194

    申请日：1994-04-04

    Applicant: CANON KK

    Inventor： KOYAMA TAKASHI

    IPC: G01C3/06 ,  G02B7/32 ,  G03B13/36

    Abstract: PURPOSE:To enable multi-point measurement at a wider angle by arranging two projection systems, main and sub, to prevent the lowering of projection efficiency and the far-near competition with a wider projection range of the sub projection means than that of the main projection means. CONSTITUTION:This apparatus is made up of a main projection means which comprises a main projection lens 1 and a main projection element 2 having light emitting parts 2a, 2b and 22 and a dome-shaped part made of a synthetic resin and a sub projection means which comprises a compound-eye sub projection lens 3 and a sub projection element 4. The sub projection lens 3 is a compound eye lens which has two emission surfaces 3a and 3b and an incident surface 32 common in axis with the emission surface 3a and an incident surface 3d common in axis with the emission surface 3b and emits 3a and 3b a luminous flux emitted from a light emitting part 4a of the element 4 in a wider range (6 deg. or more of the angle in the direction of projection) than a projection range of the main projection means. Then, the reflected light of the light emitted to an object from the light emitting parts 2a, 2b and 22 is received with photodetectors 6a, 6c and 6d and the reflected light of the light emitted from a light emitting part 4a is received with a photodetectors 60a and 6e.

    VARIABLE POWER FINDER
    29.
    发明专利
    VARIABLE POWER FINDER 失效

    公开(公告)号：JPH07152070A

    公开(公告)日：1995-06-16

    申请号：JP32584593

    申请日：1993-11-29

    Applicant: CANON KK

    Inventor： MITSUSAKA MAKOTO ,  KOYAMA TAKASHI

    IPC: G03B13/12 ,  G02B13/18 ,  G02B15/16

    Abstract: PURPOSE:To obtain a variable power finder by which an excellent finder image is observed all over the variable power range with a high variable power. CONSTITUTION:When the finder image formed by an objective lens OL having positive refractive power is inverted through an image invertion optical system P and made an erect normal image and then observed through an eyepiece EL, the objective lens OL is constituted of a variable power system provided with two lens groups, a1st group L1 having negative refractive power and a 2nd group L2 having the positive refractive power, and changes an interval between both lens groups so as to vary power, and, the 1st group L1 has a 1a lens whose one lens face, at least, is aspherical and whose concave surface faces an observation side, and a 1b lens which is negative and whose concave surface faces an objective side, and the peripheral part of the 1a lens has the positive refractive power.

    ZOOM LENS
    30.
    发明专利
    ZOOM LENS 失效

    公开(公告)号：JPH0713080A

    公开(公告)日：1995-01-17

    申请号：JP17992993

    申请日：1993-06-25

    Applicant: CANON KK

    Inventor： HOSHI KOJI ,  NISHIO TERUHIRO ,  ITO YOSHIAKI ,  MITSUSAKA MAKOTO ,  KOYAMA TAKASHI

    IPC: G02B13/18 ,  G02B15/20

    Abstract: PURPOSE:To shorten the overall length of the lens while securing an about X2.5 variable power ratio by properly setting movement conditions of respective lens groups accompanying with variable power and the lens constitution of the respective lens groups. CONSTITUTION:This zoom lens is provided with a 1st group L1 which has positive refracting power, a 2nd group L2 which has positive refracting power, a 3rd group L2 which has negative refracting power, and a 4th group L4 which has negative refracting power, i.e., four lens groups in order from an object side. When the power is varied from the wide-angle end to the telephoto end, the respective lens groups are moved to an object so that the interval between the 1st group L1 and 2nd group L2 increases, the interval between the 2nd group L2 and 3rd group L3 decreases, the interval between the 3rd group L3 and 4th group L4 increases, and the interval between the 4th group L4 and an image plane increases; and a condition 0.2

Patent Agency Ranking