JPS6197635A - Inside-finder information displaying device - Google Patents

Abstract

PURPOSE:To efficiently illuminate an information body inside a finder to observe brightly information body, by constituting a lighting means for the inside-finder information body of a prism equipped with a prescribed plane of incidence, reflecting plane, and a diffusing section to internal and external luminous fluxes. CONSTITUTION:When photographing circumstance is bright, an information body (for example, transmitting type liquid crystal display plate) 7 is illuminated by leading external luminous flux made incident from an illuminating window 5 from the plane of incidence 6c of a prism 6 and emitting the luminous fluxes from the exit plane 6a equipped with a diffusing body of the prism after the luminous flux are reflected by a reflecting plane 6d. Luminous flux coming out from the information body 7 are observed through a light leading means 8, roof prism 3, and an eyepiece 4. When photographing circumstance is dark a light source 9 turned on and the luminous flux of the light source 9 is led from the plane of incidence 6b of the prism 6 and emitted from the exit plane 6a, and thus, the information body 7 is illuminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-finder information display device, and more particularly, an information body disposed in a part of the finder is arranged in the light flux from a lighting window provided on the exterior of the camera or (and) disposed in the finder. This invention relates to an information display device in a finder which is illuminated with a luminous flux from a light source and is observed on a finder image.

Conventionally, L7tff is placed in a part of the viewfinder. When observing the information body together with the finder image, when the shooting environment is bright, the information body is illuminated by introducing external light flux through the lighting window provided on the exterior of the camera. When it was dark, the internal light from the light source inside the camera was used to illuminate the camera, thereby saving power. For example, a triangular prism 11, as shown in FIG. 1, is often used as an illumination means for illuminating the external light flux and the internal light flux in an information-filled manner. 1st
The prism 11 shown in the figure introduces an external light beam from a surface 11-1, introduces a light beam from a light source 11-5 from a slope 11-2, and allows both light beams to exit from the other surface 11-3. -4 is illuminated. Generally, the internal luminous flux is slope 11
-2, the illumination efficiency is poor because a lot of luminous flux is lost, and the information body 11-4 has to be made quite high in the brightness of the light source 11-5.
It is not possible to brightly illuminate the skin.

The present invention provides an information display device in a finder that efficiently illuminates an information body placed in a part of the finder not only with an external light beam but also with an internal light beam, making it possible to view the bright information body along with the finder image. purpose.

The main features of the finder information display device for achieving the object of the present invention are that an information body is placed in a part of the finder, and the information body is placed on the exterior of the camera and enters through a light window. In the information display device in the viewfinder for a companion camera, the information display device in the viewfinder for a friend camera is illuminated by an external light beam or an internal light beam from a light source disposed in the camera through the illumination means. The illumination means is provided adjacent to the entrance surface S for the external luminous flux and the entrance surface S□, and a part of the luminous flux incident from both the entrance surface S for the internal luminous flux and the incidence surfaces S and S2 is At least four of the light beams incident from both the reflection surface S3 and the incident surface S2 and the light beam reflected from the reflection surface S3 and the exit surface S4 have a diffusion section in a part to emit the light beams that have been reflected from the reflection surface S3. It is composed of a prism with two faces.

Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a diagram of an embodiment in which the present invention is applied to a single-lens reflex camera.

In the figure, 1 is a focusing plate, 2 is a condenser lens, 3 is a penta roof prism, 4 is an eyepiece lens, and 1 is a focusing plate.
The viewfinder image formed by the condenser lens 2,
Observation is made through the pentagonal roof prism 3 and the eyepiece lens 4.

Numeral 5 is a lighting window provided in a part of the exterior of the camera, and numeral 6 is an illumination means, which in this embodiment is composed of a prism body.

6a is an exit surface having a diffusion surface provided on the prism 6;
6b is an entrance surface for introducing the light beam from the light source 9, and 6c is an entrance surface for introducing the external light beam.

Reference numeral 7 denotes an information body, for example, a transparent liquid crystal display panel.

Reference numeral 8 denotes a light guiding means for guiding the light beam from the information body 7 to the bottom surface of the P/Tadaha prism 3. In this embodiment, when the photographing environment is bright, the external light beam introduced through the lighting window 5 is passed through the entrance surface 6c of the prism 6 and reflected at the reflection surface 6d. 1
The light emitting device 61 illuminates the information body 7. The light beam from the information body 7 is made to enter the pentagonal roof prism 3 from the bottom surface thereof via the light guiding means 8. At this time, the information body 7 is configured to have approximately the same diopter as the focusing plate 1.

The information body 7 is displayed in a part of the field of view of the finder and viewed together with the finder image.

When the photographing environment is dark, the light source 9 is turned on automatically or manually, and the internal luminous flux from the light source 9 is introduced through the entrance surface 6b of the prism 6, and is emitted through the exit surface 6a to form the information carrier 7t.
-Illuminate.

As described above, in this embodiment, efficient illumination is achieved by providing two entrance planes for allowing the external light beam and the internal light beam to enter substantially perpendicularly to each other.

That is, in the past, as shown in FIG. 1, the light source 11-5 was placed near the slope 1]-2 of the prism 11, and the light beam was introduced from the slope 11-2, so that the angle of incidence was increased and the incident surface l.
]-2, the transmittance decreases, and the amount of light that can be effectively incident is small, resulting in a large amount of light loss. On the other hand, in this embodiment, efficient illumination is made possible by providing the prism 6 with an entrance surface 6b on which the light beam from the light source 9 enters substantially perpendicularly. In addition, a diffusion section is provided in a part of the exit surface 6&,
By illuminating the information body 7t through this diffusion portion, the information body 7 is uniformly illuminated, and the luminous flux from the information body 7 is efficiently guided to the bottom surface of the pentagonal roof prism 3.

FIG. 3 is a diagram showing the difference in illumination efficiency between the conventional illumination means and the illumination means of the present invention. In the figure, 9' is the light source at the conventional position, A is the external light that hits the center of the diffusing surface 6a, and B □
, B2 are the light beams emitted from the light source 9, and C is the light source 9'.
It is a ray of light emitted from.

As can be seen from Fig. 3, in the conventional case, the incident angle is steep, so the transmission loss due to the incident surface is large and 9. However, in the present invention, the transmission loss is small, and in addition to the light beam directly hitting the diffusing surface, there is also a reflective surface. It is totally reflected and reaches the diffusive surface. Furthermore, in this embodiment, since the luminous flux B2 is also used for illumination, the illumination efficiency can be greatly improved.

The above description describes nine cases in which the present invention is applied to a single-lens reflex camera as an embodiment.
The present invention can also be applied to video cameras and the like.

Further, the information carrier may be made of a transparent material, or further may be made of liquid crystal.

As described above, according to the present invention, although the light source for internal illumination can be placed in a space where it hardly gets in the way at the periphery of the camera housing, the information body placed in a part of the viewfinder can be placed inside the camera housing. It is possible to achieve an in-finder information display device that can efficiently illuminate both the luminous flux and the external luminous flux, and allows observation of a 5 KBA bright information body in the finder itself.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a conventional illumination means, Fig. 2 is a schematic diagram of the present invention applied to a single-lens reflex camera, and Fig. 3 is an explanatory diagram for comparison between the present invention and a conventional example. . In the figure, 6 and 11 are lighting means, 5 is a lighting window, and 7° 11-4
is the information carrier, 6a is the exit surface, 6b and -6c are the entrance surfaces,
9, 1l-5 is a light source, and 8 is a light guiding means.

Claims (2)

[Claims] (1) An information body is placed in a part of the viewfinder, and the information body is illuminated by an external light beam that enters through a lighting window provided on the exterior of the camera or (and) an internal light beam from a light source placed inside the camera. In an information display device in a finder for a camera, which is illuminated through a means to be observed together with a finder image, the illumination means is provided adjacent to the entrance surface S_1 for the external light beam and the entrance surface S_1. The incident surface S_2 and the incident surfaces S_1, S_
a reflective surface S_3 for reflecting a part of the luminous flux incident from both of the incident surfaces S_1 and S_2; Injection surface S_ with a diffusion part in the part
1. An information display device in a finder, comprising a prism having at least four surfaces. (2) The in-finder information display device according to claim 1, wherein the information body is arranged near the bottom surface of a pentagonal roof prism in the finder.