Automatic focusing camera
First Claim
1. An ultrasonic transmitter for use in an ultrasonic ranging system for a camera capable of accepting various interchangeable lens assemblies having corresponding various angles of view, comprising:
- an ultrasonic generator, the directivity of which varies with the ultrasonic frequency generated thereby;
a camera mount for receiving a selected one of said lens assemblies;
frequency determining means operatively associated with said camera mount and adapted to be coupled to said selected one of said lens assemblies when the selected assembly is received by said camera mount, for establishing a frequency control parameter corresponding to the angle of view of said selected lens assembly; and
ultrasonic frequency control means coupled to said ultrasonic generator and responsive to said frequency control parameter for setting the ultrasonic frequency of said generator in accordance with the angle of view of said selected lens assembly, so that the directivity of said ultrasonic generator corresponds to the angle of view of said selected lens assembly.
1 Assignment
0 Petitions
Accused Products
Abstract
An automatic focusing camera is provided with an ultrasonic distance measuring instrument capable of varying the directivity of an ultrasonic beam to be transmitted depending upon the angle of view of a photographic lens used. A plurality of circuit components one of which is selected so as to determine the oscillation frequency of an oscillator mounted in a camera body depending upon the angle of view of a photographic lens attached to the camera are mounted on the camera body, and a selecting means is mounted on the lens mount of a photographic lens at a position corresponding to the angle of view thereof so that when the photographic lens is attached to the camera body, its selecting means establishes an electrical connection of a predetermined one of said circuit components to said oscillator, whereby the latter oscillates at a predetermined frequency and consequently the ultrasonic beam transmitted has a predetermined directivity corresponding to the angle of view of the photographic lens.
6 Citations
5 Claims
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1. An ultrasonic transmitter for use in an ultrasonic ranging system for a camera capable of accepting various interchangeable lens assemblies having corresponding various angles of view, comprising:
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an ultrasonic generator, the directivity of which varies with the ultrasonic frequency generated thereby; a camera mount for receiving a selected one of said lens assemblies; frequency determining means operatively associated with said camera mount and adapted to be coupled to said selected one of said lens assemblies when the selected assembly is received by said camera mount, for establishing a frequency control parameter corresponding to the angle of view of said selected lens assembly; and ultrasonic frequency control means coupled to said ultrasonic generator and responsive to said frequency control parameter for setting the ultrasonic frequency of said generator in accordance with the angle of view of said selected lens assembly, so that the directivity of said ultrasonic generator corresponds to the angle of view of said selected lens assembly. - View Dependent Claims (2, 3, 4, 5)
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Specification