JPS6199138U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an example of a liquid crystal cell. FIG. 2 is a graph showing the relationship between the voltage and the amount of transmitted light of the liquid crystal cell shown in FIG. FIG. 3 is a circuit diagram of an embodiment of the present invention. FIG. 4 is a perspective view showing the arrangement of a liquid crystal cell and a lamp. FIG. 5 is a perspective view showing the optical path of information. FIGS. 6 and 7 are perspective views showing other arrangements of liquid crystal cells and lamps. 13...CdS light receiving element, 15...lamp, 17...
Transistor, 22... Liquid crystal cell, 31... Pentaprism, 35, 38, 42... Prism, 40... Drive circuit.

Amendment December 5, 1980 The claims for utility model registration and the brief description of the drawings are amended as follows. The name of the invention is amended as follows. Name of invention Camera display lighting device

[Scope of Claim for Utility Model Registration] A light-receiving electro-optical element such as a transmissive liquid crystal display disposed close to the pentaprism of the viewfinder optical system in order to enter the display light of photographic information into the pentaprism. A camera having a light metering circuit including a light receiving element for detecting the brightness level of a subject, and a lighting section for guiding outside light to the display; determining that the output level from the light-receiving element in the photometric circuit and a self-luminous light source disposed at a position shifted from the luminous flux line of the external light directed toward the display device has become lower than a predetermined luminance; a drive circuit that generates a lighting output to the self-luminous light source; and a light guide member disposed on the external light incident surface side of the display device to guide the light emitted from the self-luminous light source to the display device. , when the external light has a predetermined brightness or higher, the display light enters the pentaprism using only the transmitted light of the external light through the display device, and on the other hand, when the external light is lower than the predetermined brightness, the display light enters the pentaprism. A display illumination device for a camera, wherein the self-luminous light source is turned on and the display light is transmitted into the pentaprism using the emitted light transmitted through the display device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an example of a liquid crystal cell. FIG. 2 is a graph showing the relationship between the voltage of the liquid crystal cell shown in FIG. 1 and the amount of transmitted light. FIG. 3 is a circuit diagram of an embodiment of the present invention. FIG. 4 is a perspective view showing the arrangement of a liquid crystal cell and a lamp. FIG. 5 is a perspective view showing the optical path of information. FIG. 6 is a perspective view showing another arrangement of the liquid crystal cell and the lamp. 13...CdS light receiving element, 15...lamp, 22...
Liquid crystal cell, 31...Penta prism, 35, 38...
Prism, 37... Scattering plate, 40... Drive circuit, 41
...Lighting window.

Claims (1)

[Scope of utility model registration request] 1. A display illumination device for a camera, comprising a display means provided on the camera, a light emitting means arranged near the display means, and a switching means connected to the light emitting means.