JPH08137007A - Single-lens reflex camera - Google Patents

Abstract

PURPOSE: To prevent nonconformity in fixation by an adhesive by fixing a film surface reflected light measuring light receiving element to a structure to form a mirror box bottom surface part by a method except adhesion. CONSTITUTION: A film surface reflected light measuring part is composed of a light receiving element 1 and a condenser lens 2. These are installed in and fixed to a prescribed place of a structure 10 to form a mirror box bottom surface part having a film surface observing window. The light receiving element and the condenser lens are installed and held by energizing force of an elastic member 30 fixed to a prescribed position of the structure so as to be mountable and demountable instead of direct adhesion by use of a conventional adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-lens reflex camera having a function of measuring reflected light on a film surface.

[0002]

2. Description of the Related Art Conventionally, in a single-lens reflex camera of this type, a light receiving element provided on the bottom surface of a mirror box of a camera body is used to measure the reflected light on the film surface. ing.

As a method of fixing the light-receiving element in such a conventional camera, as shown in FIG. 3, the light-receiving element 1 and a condenser lens for supplying the light-receiving element 1 with light reflected by a film surface (not shown). 2 and 1 are integrated by adhesion,
A method of fixing the integrated light receiving element 1 and the condenser lens 2 to the mounting portion 3a of the mirror box bottom plate 3 which is a member forming the bottom surface of the mirror box by adhesion is generally used.

Reference numeral 4 in the drawing denotes a flexible printed circuit board (hereinafter referred to as FPC) for mounting the light receiving element 1, which is mounted by soldering a terminal group of the light receiving element 1 to a predetermined pattern formed on the FPC 4. It is configured to do.

However, according to such a conventional film-surface reflected-light photometry unit, in the case where there is an adhesion error or an adhesive peeling, the adhesive used as the above-mentioned fixing means is the attachment position of the light receiving element 1. Therefore, the mirror box bottom plate 3 becomes unusable and must be replaced with a new one.

[0006]

By the way, when the camera which intends to adopt the film surface reflected light photometry section as described above is a single-lens reflex camera, the structure 10 of the camera body, for example, explains the present invention. As is clear from FIG. 1, bayonet mount 11 and mirror box 1
2, the shutter substrate, the prism box seat 13 and the like are often of a composite structure that performs many functions, and such a structure 10 itself is expensive.

The fact that such a structure 10 becomes unusable due to defective adhesion of the light receiving element 1 for photometry on the film surface reflected light as described above, and requiring replacement is very costly. It is disadvantageous and it is desired to take some measures.

The present invention has been made in view of such circumstances, and a method other than bonding a light receiving element used for photometry of light reflected on a film surface to a structure forming the bottom surface of a mirror box, for example, an engaging claw. It is an object of the present invention to obtain a single-lens reflex camera that can eliminate defects caused by the use of conventional adhesives by being configured so that it can be assembled and fixed by fitting such as.

[0009]

In order to meet such demands, the single-lens reflex camera according to the present invention has a function of measuring the reflected light on the film surface, and an observation window for the film surface. A structure that forms the bottom surface of the mirror box, a light receiving element that measures the light reflected on the film surface through the film surface observation window, and a light receiving element that is located between these structures and the light receiving element. It is equipped with a condenser lens that supplies the reflected light on the film surface, and these light receiving element and condenser lens are assembled and held by the biasing force of an elastic member that is detachably assembled and fixed to a predetermined position of the structure. It was made to let.

[0010]

According to the present invention, the light receiving element for photometry of the film reflected light and the condenser lens are detachably assembled and fixed to the bottom surface of the mirror box by the urging force of the elastic member. It is possible to prevent the mirror box from becoming unusable due to a problem caused by direct bonding to the bottom plate of the mirror box.

[0011]

1 and 2 show an embodiment of a single-lens reflex camera according to the present invention. In these drawings,
The same or corresponding portions as those in FIG. 3 described above are designated by the same reference numerals, and detailed description thereof will be omitted. Here, in FIG. 1, reference numeral 10 is a structure of the camera body, and includes a bayonet mount seat 11, a prism box seat 14, and a mirror box 1.
2. It has a structure in which functions such as a shutter substrate are incorporated.

In the camera structure 10 described above, the bottom portion 20 of the mirror box portion has holes 21 corresponding to the three lens portions 2a of the condenser lens 2 for the reflected light on the film surface, and the condenser lens 2. The notch 22 corresponding to the positioning protrusion 2b for the camera structure 10 is formed as a mounting portion for the film surface reflected light photometry unit.

Further, the condenser lens 2 has two protrusions 2c.
The light-receiving element 1 is bonded to the condenser lens 2 in a state in which the light-receiving element 1 for photometry on the film surface is engaged and positioned with the two holes 1c. Reference numeral 4 in the figure denotes an FPC for mounting the light receiving element 1, and the terminal group 1a of the light receiving element 1 is soldered to a predetermined pattern prepared on the FPC 4.

The condenser lens 2, the light receiving element 1, and the FPC 4 integrated in this way are attached to predetermined positions of the camera structure 10 by the urging force of the leaf spring 30 as an elastic member. The leaf spring 30 is detachably installed by being assembled and fixed to the bottom surface 20 of the mirror box portion of the camera structure 10 with a screw 31 by a screw.

FIG. 2 is a sectional view showing the mounting state of the light receiving element 1. The condenser lens 2 and the light receiving element 1 are biased and fixed to the camera structure 10 by the spring piece portion 30a of the leaf spring 30. There is. Further, the FPC 4 is held by the holding portion 5b of the leaf spring 5 in a state of being bent in a substantially V shape.

In FIG. 2, 40 is a film surface, 41 is the center of the optical axis of the camera, and 42 is an incident optical path to the light receiving element 1.

According to this structure, the light receiving element 1 for film reflected light photometry and the condenser lens 2 are assembled and fixed to the mirror box bottom portion 20 by the biasing force of the leaf spring 30 which is an elastic member. As a result, it is possible to prevent the conventional problem that the mirror box becomes unusable due to a problem caused by direct adhesion to the mirror box bottom plate.

It is needless to say that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the single-lens reflex camera provided with the film surface reflected light photometry part can be appropriately modified or changed. For example, when the light receiving element 1 is attached and fixed, the urging force of the leaf spring 30 is used, but it is needless to say that the same effect can be obtained by using another elastic member such as a compression coil spring or rubber.

[0019]

As described above, according to the single-lens reflex camera of the present invention, the camera structure forming the bottom part of the mirror box having the observation window for the film surface and the film surface through the observation window for the film surface are used. A light receiving element for measuring the reflected light of the light, a condenser lens located between the camera structure and the light receiving element and supplying the light reflected by the film surface to the light receiving element, and the light receiving element and the condenser lens. And the elastic member that is detachably assembled and fixed to the bottom surface of the mirror box portion with a predetermined urging force, even though the structure is simple. , The problem of fixing the photometric part of the light reflected on the film surface to the bottom part of the mirror box by the conventional adhesive fixing method using an adhesive, especially the mirror box part becomes unusable An excellent effect that it is not necessary to the Rutoitta worry.

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view of an essential part of a film surface reflected light photometry section, showing an embodiment of a single-lens reflex camera according to the present invention.

FIG. 2 is a cross-sectional view of an essential part of a film surface reflected light photometry unit shown in FIG.

FIG. 3 is a schematic exploded perspective view illustrating a film surface reflected light photometry unit in a conventional camera.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Light receiving element, 1a ... Terminal group, 1c ... Hole part, 2 ... Condensing lens, 2a ... Lens part, 2b ... Positioning projection part, 2c
... protrusions, 4 ... flexible printed circuit board (FPC),
10 ... Camera structure, 20 ... Mirror box bottom part,
21 ... Hole part, 22 ... Notch part, 30 ... Leaf spring (elastic member), 30a ... Spring piece part, 30b ... Holding part, 31 ... Screw, 40 ... Film surface, 42 ... Incident optical path to light receiving element.

Claims (2)

[Claims] 1. A single-lens reflex camera having a function of measuring reflected light on a film surface, comprising a structure constituting a bottom portion of a mirror box having an observation window for the film surface, and the film surface observation window. A light receiving element for measuring reflected light on the film surface through, and a condenser lens located between the structure and the light receiving element and supplying reflected light on the film surface to the light receiving element, A single-lens reflex camera characterized in that a light-receiving element and the condenser lens are assembled and held by an urging force of an elastic member assembled and fixed at a predetermined position of the structure. 2. The single-lens reflex camera according to claim 1, wherein the light receiving element and the condenser lens are detachably attached and held at predetermined positions of the structure by elastic members. Single-lens reflex camera.