Optical distance measuring apparatus having semiconductor position sensitive photodetector
First Claim
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1. A distance measuring apparatus, comprising:
- a light, emitting element;
a light receiving element;
a wiring board having a signal processing circuit formed thereon detecting a signal current from said light receiving element; and
a housing case including a conductive material, accommodating at least said light receiving element, for directing light from said light emitting element to an object to be detected, receiving light reflected by the object at said light receiving element and measuring a distance to the object based on the signal current, wherein said housing case electrically shields at least said light receiving element from noise.
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Abstract
A light emitting element and a light receiving element are installed on a wiring board mounted in a housing case. Light emitted from the light emitting element is irradiated on an object to be detected through a first lens installed in the housing case. Light reflected by the object to be detected is received by the light receiving element through a second lens installed in the housing case. The housing case is formed of a grounded conductive material, and the wiring board is formed of a material having a coefficient of linear expansion equivalent to that of the housing case.
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Citations
20 Claims
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1. A distance measuring apparatus, comprising:
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a light, emitting element; a light receiving element; a wiring board having a signal processing circuit formed thereon detecting a signal current from said light receiving element; and a housing case including a conductive material, accommodating at least said light receiving element, for directing light from said light emitting element to an object to be detected, receiving light reflected by the object at said light receiving element and measuring a distance to the object based on the signal current, wherein said housing case electrically shields at least said light receiving element from noise. - View Dependent Claims (2, 3, 4, 5)
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6. A distance measuring apparatus, comprising:
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a light emitting element providing light to an object to be detected; a lens; a light receiving element; a signal processing circuit for detecting a signal current from said light receiving element, receiving light reflected by the object at said light receiving element through said lens, and measuring a distance to the object based on the signal current; and means for preventing a change in a relative position between said lens and said light receiving element caused by a change in temperature. - View Dependent Claims (7, 8, 9)
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10. A distance measuring sensor comprising:
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a light emitting element; a light receiving element; a wiring board provided with a signal processing circuit for detecting a signal current from said light receiving element accommodated in a conductive housing case, receiving the light reflected by the object at said light receiving element, and measuring a distance to the object based on the signal current, wherein said housing case is conductive, is grounded, and is formed of a material having a coefficient of linear expansion equivalent to that of said wiring board. - View Dependent Claims (11, 12, 13, 14)
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15. A distance measuring apparatus, comprising:
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a light emitting element, a light receiving element, an IC including a signal processing circuit for detecting a signal current from said light receiving element, a wiring board having said IC mounted thereon, an optical arrangement for directing light from said light emitting element to an object to be detected and receiving light reflected by the object at said light receiving element, wherein the signal processing circuit measures a distance to the object based on the signal current, and wherein said IC is shielded from noise impinging on two sides of the IC. - View Dependent Claims (16, 17, 18)
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19. A distance measuring sensor having an LED, a position sensitive photodetector, and an IC including a driving circuit of said LED and a signal processing circuit of said position sensitive photodetector, wherein
said IC is mounted on a board with a grounded lead frame such that said IC is mounted between the lead frame and the board.
Specification