JPS58216232A - Finder - Google Patents

Abstract

PURPOSE:To easily recognize the photographing field of view even under a dark visual field, by installing luminous substances in the boundary area of the visual field of a finder. CONSTITUTION:LEDs 32 are installed on the focusing plane 30 of a focusing glass plate 20. They 32 emits light by means of batteries when a switch is turned on. The LEDs 32 are installed to the four corners of the focusing glass plate 20 and the photographing field of view can be recognized clearly by actuating the LEDs 32 when the photographing is made under a dark visual field. Therefore, the visual field and composition can easily be confirmed even under dark visual fields where the confirmation of them is very difficult by conventional finders. Liquid crystal, luminous paint, and others can be used as the luminous substance of this purpose. The LEDs can be installed to any places, for example, the lower surface of a pentagonal prism 24 or upper surface of a condenser lens, where the LEDs 32 can make the visual field of the finder clear.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a finder that allows the photographing range to be easily recognized even in a dark field.

A camera's finder is indispensable for confirming the subject and shooting range and determining the composition of the photograph. However, when a photographer looks into the finder from the eyepiece of the finder, the field of view the photographer obtains is not the same as the field of view obtained through the finder. That is, the photographer's field of view includes the so-called viewfinder frame in addition to the photographic field of view obtained through the finder. For this reason, when photographing in a so-called dark field, such as at dusk or in a dimly lit place, the boundary between the photographing field and the frame is not clear9, making it difficult to determine the photographing field and composition. A similar phenomenon also occurs when the color of the subject or the subject must be photographed against a dark background.

Particularly in the field of medical photography, it is often necessary to take photographs against a dark background, such as dark-field photography, photography of specimens and removed organs, photography of equipment, photography using a fluorescence microscope, etc.

When photographing in such a dark field, the photographer must:
It is necessary to stare into the viewfinder to determine the photographic field of view and composition, which requires careful attention, which is tiring and easy to make mistakes.

The present invention has been made to eliminate the drawbacks of the prior art, and an object of the present invention is to provide a finder that can easily determine the field of view even in a dark field.

The present invention arranges a luminous object at the boundary of the field of view of the finder,
The structure is such that the photographing field can be easily recognized even under dark field conditions.

A preferred embodiment of the finder according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of a single-lens reflex camera equipped with a finder according to the present invention and has a nine-penta prism finder, and FIG. 2 is an enlarged view of the penta prism finder shown in FIG. In FIG. 1, a compound lens 12 including an objective lens 11 and consisting of a plurality of lenses for correcting chromatic aberration, spherical aberration, etc. is housed inside a lens barrel 10. A diaphragm t4 is provided. A reflecting mirror 16 provided at the rear of the compound lens 12 is fixed at an angle of 45 degrees with respect to the optical axis of the compound lens 12, and changes the traveling direction of the light 18 entering from the objective lens 11 by 90 degrees and directs it upward. It is designed to reflect. A focusing glass 20 is provided above the reflecting mirror 16, and a condensing lens 22 is provided on the top surface of the focusing glass 20. Furthermore, a pentagonal prism 24 is arranged above the condensing lens 22, and a pentagonal prism 24 is arranged above the condensing lens 22.
6 and is reflected by the focusing glass 2o and the condensing lens 2.
It is a trap that refracts the light 18 that has passed through the lens 2 and guides it to the eyepiece lens 26. Note that the reference numeral 28 shown behind the reflecting mirror 16 is a film surface.

In the first embodiment of the present invention, as shown in FIG. 2, a light emitting diode 32 is placed on the focusing surface 3o of the focusing glass 2o.
is located. The light emitting diode 32 receives current from a battery (not shown) and emits light by turning on a switch (not shown). The light emitting diodes 32 are arranged at the four corners of the focusing glass 20, and when photographing in a dark field state, by lighting the light emitting diodes 32, it is possible to clearly see the field of view. There is.

Therefore, it is now possible to easily check the field of view and composition even under dark field conditions, where it was previously very difficult to check the field of view and composition, which not only reduces photographer fatigue but also allows for accurate photography. be able to.

In the above embodiments, a light emitting diode was used as the light emitting material, but the light emitting material may be a liquid crystal or a light emitting material such as a luminescent paint.

Note that when a luminescent paint is used, there may be a problem that the amount of light from the luminescent paint decreases, but in this case, it is possible to recover the amount of luminescence by allowing light to enter through the eyepiece lens 26.

Furthermore, in the embodiment described above, the case where the light emitting diode 32 was arranged on the top surface of the focusing glass 20 was explained.
The light emitting diode 32 may be placed anywhere as long as it can provide a clear view of the finder (for example, on the bottom surface of the pentaprism 24 or on the top surface of the condenser lens 22 as shown in FIG. 3). Further, in the above embodiment, the case where the light emitting diodes 32 are provided at the four corners of the focusing glass 20 has been described, but the field of view can be made clearer by arranging the light emitting diodes 32 over the entire circumference of the focusing glass. Further, in the above embodiments, a pentagonal prism finder has been described, but other finders, such as a direct view finder, may be used. It goes without saying that the present invention can also be applied to finders of movie cameras and video cameras.

As described above, according to the present invention, by arranging the light emitting object at the field boundary of the finder, it is possible to easily confirm the photographing field even in a dark field.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a single-lens reflex camera having a pentaprism type finder, Fig. 2 is an explanatory diagram showing an embodiment of the finder according to the present invention, and Fig. 3 is an explanatory diagram of an embodiment of a condensing lens in which a light emitting diode is arranged. FIG. 3 is a perspective view of an example. 11...Objective lens, 16...Reflector, 20
... Focusing glass, 22 ... Condensing lens, 24
...Pentaprism, 26...Eyepiece, 32.
...Light emitting diode. Agent Tatsuyuki Unuma (and 2 others)

Claims (1)

[Claims] 1. A finder for a camera that allows a subject facing an objective lens to be confirmed and a shooting range to be recognized, characterized in that a light-emitting object is disposed at the boundary of the field of view of the finder.