JPH1165036A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a dustproof property, shading effect and joining at claw joints. SOLUTION: In this film unit, parts molded by using a plastic material are detachably joined together. In addition, in order to enhance a dust-proof property, a projecting part 62 and a recessed part 61 into which the projecting part 62 enters are formed on each joining part in between members in a body base 30. The projecting part 62 is formed with such a length as to come into contact with an inside wall 61c in the space of the recessed part 61 and as to be bent when joined by means of claw joints.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens-equipped film unit having a structure in which a plurality of plastic covers for protecting an internal mechanism are detachably attached to each other by nail coupling.

[0002]

2. Description of the Related Art A simple exposure mechanism is provided so that anyone can easily enjoy photographing, and a film unit with a lens (hereinafter referred to as a "film unit") in which an unexposed photographic film and a cartridge are built in at the time of manufacture. Is well known.

In this film unit, a photographing mechanism and a photographic film cartridge are covered with a plurality of outer covers.
The outer cover includes a front cover and a rear cover that are divided in the front-rear direction (the direction of the photographing optical axis). These outer covers are made of a plastic material. The photographic film cartridge is covered with a main body base and a rear cover. The body base is a cover that is hidden inside the outer cover.On both sides of the exposure opening, a cartridge storage chamber for storing the cartridge, and a film roll for storing the photo film in a roll form by pulling out the photo film from the cartridge. Room. The cartridge storage chamber and the film roll chamber are open at the back and bottom surfaces, and the cartridge and the film roll are loaded into the interior from behind or from below. The rear cover is coupled to the front cover on the outer surface, and is also coupled to the main body base so as to close the opening of the main body base inside. This main body base is also formed of a plastic material.

[0004] At the joints between the above-mentioned covers, a ridge and a ridge are formed. These projections and recesses form a labyrinth structure for the purpose of dustproofness and light tightness by fitting. The attachment of the mutual covers is made up of a resilient locking claw and a locked portion formed by a concave portion or an opening engaged with the locking claw.

[0005]

By the way, since the cover itself is made of a material having elasticity, even if the locking claw and the locked portion are locked, the labyrinth structure has a convex and a concave portion. There is a gap between the two, and the dustproofing and light-shielding properties are reduced.
Eliminating the gap requires high-precision molding, which increases the manufacturing cost.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems and to provide a film unit with a lens in which the gap between the covers is managed at a low cost and the dust-proofing and light-shielding properties are improved.

[0007]

In order to solve the above-mentioned problems, according to the present invention, one of two parts to be connected to each other is integrally formed with a resilient projection. The protruding portion is formed with a protruding length that bends in contact with the other component that is opposed when the nail is coupled. A plurality of protrusions may be provided intermittently along the entire circumference of the joint between the two components to be nail-connected, or may be provided on the entire circumference. In the case where the projection is provided in a part, the projection is positioned at least on a line perpendicular to the locking direction of the locking claw and the locked portion forming the claw connection. It is preferable to form it.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a film unit 10 includes a photographing lens 13, a winding knob 14, a finder optical system 15, a strobe light emitting section 16, a strobe charging start operating member 17, a number-of-shots display window 19, A charging completion display window 20, a shutter button 21, and the like are provided to be exposed. Also, on the front left side of the film unit 10,
A grip portion 22 bulging in the front direction is formed.
The bottom cover 23 is disposed on the bottom surface of the grip 22. The bottom cover 23 is opened when taking out the cartridge containing the photographed photo film.

The outer cover of the film unit 10 is shown in FIG.
As shown in FIG. 1, the front cover 25 and the rear cover 26 are provided. These covers 25 and 26 cover the exposure unit 27, the strobe unit 28, the photographic film cartridge 29, and the main body base 30 with a sandwich structure from front and rear along the photographing optical axis 13a. These front covers 25
The joint between the rear cover 26 and the top surface, the left and right side surfaces, and the bottom surface of the film unit is removably attached to each other by nail coupling.

The exposure unit 27 is a unit component in which the photographic lens 13, a shutter mechanism, a film unwinding mechanism, a film counter mechanism, a finder optical system 15, and the like are integrally incorporated. This exposure unit 27
It is detachably attached to the center of the front surface of the main body base 30 by nail coupling.

On the front surface of the front cover 25, exposure holes 31 and 32 for exposing the photographing lens 13 and the finder objective lens of the finder optical system 15 are provided. On an upper surface of the front cover 25, a shutter button 21 for operating a shutter mechanism is integrally provided.

As the photographic film cartridge 29, for example, one corresponding to an IX240 film cartridge is used. Note that a 135-type photo film cartridge may be used. Photo film cartridge 29
Comprises a photo film 34, a spool 35 around which the photo film 34 is wound, and a cartridge 36 for rotatably storing the spool 35.

An exposure opening 37 is formed at the center of the main body base 30, and a cartridge chamber 38 and a film roll chamber 39 are formed on both sides thereof. In the cartridge chamber 38 and the film roll chamber 39, a cartridge 36 and a photographic film 34 drawn from the cartridge 36 are rolled into a film roll 34.
a is stored. These chambers 38, 39 are open at the back and bottom, and the back is closed by the rear cover 26, and the bottom is light-tightly closed by the bottom lids 23, 40 provided on the rear cover 26 in a pull-top manner.

A winding knob 14 is provided at an upper portion of the cartridge chamber 38. The wind-up knob 14 is engaged with a spool 35 and rotates the spool 35 in a film winding direction (the direction of the arrow shown in FIG. 1) to constitute a film winding mechanism that winds the photographed photo film 34 into the cartridge 36. I have.

The rear cover 26 has a finder eyepiece window 4.
1 and a charge completion display window 20 are provided. Also,
At the upper end of the rear cover 26, an opening 42 for exposing a part of the periphery of the winding knob 14 to the outside is formed.

The strobe unit 28 includes a circuit board 50
The main unit 51 includes a main capacitor 51, a power supply battery 52, a synchro switch 53, a strobe light emitting unit 16, and the like. Light is directed toward the subject. The strobe unit 28 is positioned on the film roll chamber 39 side of the main body base 30 by positioning means provided on the main body base 30, and is held by a claw connection provided on the main body base 30.

As shown in FIG. 4, a ridge 60 and a ridge 61 are formed all around the joint between the main body base 30 and the rear cover 26. The concave ridge portion 61 is formed by providing projecting pieces 60a, 60b protruding opposite to the convex ridge portion 60 at predetermined intervals, thereby forming a concave portion 61c therebetween along the seam. In addition, instead of providing a pair of projecting pieces 61a and 61b as the concave ridge 61,
It may be a form in which one step is formed in the thickness direction.

The protruding ridge portion 60 enters the inside of the concave portion 61c to form a labyrinth structure, and has a length that does not contact the inner wall of the concave portion 61c when it enters. The protruding portion 60 is formed with a protruding portion 62 having a longer protruding length at an arbitrary position in the entire circumference along the seam direction. As shown in FIG. 1, when the main body 30 and the rear cover 26 are nailed together, the convex portion 62 faces the convex portion 62 of the inner wall of the concave portion 61c as shown in FIG. The inner wall 61d is bent to abut on the inner wall 61d.

The claw connection is constituted by a resilient locking claw 63 and a locked portion to which the locking claw 63 is locked, in this example, an edge of an opening 64. In this example, an opening is provided in the main body base 30, and a locking claw 63 is provided in the rear cover 26. A plurality of such nail couplings are provided at arbitrary positions along the entire circumference of the joint, and are coupled so as not to be separated from each other along the mounting direction. The mounting direction in this example is the direction of the photographing optical axis 13a.

The convex portion 62 urges the components 26 and 30 away from each other by a force that returns by bending. As a result, the nail connection is further strengthened by the restoring force of the projection 62. Therefore, the position where the convex portion 62 is provided is desirably in the vicinity of the claw connection.

The operation of the above embodiment will be described. As shown in FIG. 4, the rear cover 26 is inserted into the main body base 30 along the mounting direction (the direction of the arrow shown in FIG. 4). As a result, before the locking claw 63 engages with the opening 64, the tip of the convex portion 62 enters the inside of the concave portion 61c and comes into contact with the inner wall 61d facing in this direction. Then, the rear cover 26 is attached to the main body base 3.
Further, the protrusion 62 bends to one side, and then the locking claw 63 engages with the opening 64 to be in the state shown in FIG. After the engagement, the projection 62 attempts to return to the original posture. This force urges the rear cover 26 and the main body base 30 in a direction of separating them. Since this urging force is prevented by the locking between the locking claw 63 and the edge of the opening 64,
The rear cover 26 and the main body base 30 do not separate. Moreover, even when the engagement margin between the locking claw 63 and the edge of the opening 64 is accurately formed between the locking claw 63 and the edge of the opening 64 in the locked state, the shrinkage or sink due to the molding of the mold is caused. Although some gaps may be generated due to the above, these errors can be absorbed by the bending of the convex portion 62, so that the molding accuracy between the locking claw 63 and the edge of the opening 64 can be roughened, and cost reduction can be achieved. Can be.

In the above embodiment, a part of the ridge 60 is formed as the ridge 62, and the ridge 62 abuts against the inner wall 60d of the recess 60c to be bent. The protruding length may be increased so that the protruding portion comes into contact with the inner wall 60d of the concave portion 60c and bends. In this case, in addition to the dust-proof property, the light-shielding property is also improved. Such a structure is preferably provided at the joint of the cover members constituting the film cartridge, for example, at the joint of the rear cover 26 and the main body base 30 in this embodiment.

When the protruding portion 62 or the protruding ridge portion 60 is bent, there is a possibility that inconvenience such as whitening or breaking of the root may occur. In order to prevent such an inconvenience, it is desirable to increase the thickness at the root and to reduce the thickness at the tip as shown in FIG.

Depending on the bending direction of the projection 62 or the ridge 60, the cover may be displaced along the direction perpendicular to the mounting direction, and the locking claw 63 may easily come off the locked portion. Occurs. Therefore, the bending direction may be restricted to a predetermined direction by devising the tip shape of the abutment portion 62 or the protruding ridge portion 60 in accordance with the engagement mode of the claw connection or the connection mode of the parts or the like.

FIG. 5 shows a cutout 70 formed by cutting the inside of the tip 70. The notch 71 restricts the bending of the tip 70 along the downward direction.
In FIG. 6, a chamfer 72 is formed at the tip, and the bending direction is regulated in a predetermined direction (the direction of the arrow shown in FIG. 6).
In the example shown in FIG. 6, a chamfer 72
Is provided, the bending direction is downward.

In the above embodiment, the projection and the recess are provided at the joint of the rear cover 26 and the main body base 30, respectively. However, the present invention is not limited to these parts, and for example, the front cover 25 and the rear cover Needless to say, any joint can be provided as long as the joints connect the plastic parts constituting the film unit 10, such as the exposure unit 27 and the main body base 30, and the like.

In the above embodiment, a projection is provided at one of the joints of the components to be connected to each other, and a recess is provided at the other of the components.
Although the convex portion is formed with a protruding length that bends in contact with the inner wall in the gap of the concave portion, the present invention is not limited to this.
Omitting b, providing convex portions so as to alternately oppose the parts to be connected to each other, and bending any one of the convex portions by contacting the surface on which the convex portion of the other component is formed. Good. Further, as another example, a convex portion is provided on only one of the components to be connected to each other, and when the nail is coupled, the convex portion comes into contact with the opposing surface of the other component and flexes. You may be able to do it.

[0028]

As described above, according to the present invention, when the parts are claw-coupled, the projections surely come into contact with the opposing surfaces of the mating parts, so that the dust-proofing and light-shielding properties are improved. At the same time, the connection of the nail connection can be further strengthened by the restoring force of the convex portion after bending. In addition, since the claw connection can be formed with rough accuracy, the cost is low.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part showing a fitting state of a convex ridge and a concave ridge according to the present invention.

FIG. 2 is a perspective view showing an appearance of a film unit with a lens.

FIG. 3 is an exploded perspective view of the film unit with a lens.

FIG. 4 is a perspective view showing a convex ridge and a concave ridge.

FIG. 5 is a cross-sectional view showing another embodiment in which a notch portion is provided at a front end and a bending direction after contact is regulated to a predetermined direction.

FIG. 6 is a cross-sectional view showing another embodiment in which a bending direction after a chamfered portion is provided at the tip and brought into contact is regulated to a predetermined direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Film unit with a lens 25 Front cover 26 Rear cover 27 Exposure unit 28 Strobe unit 30 Body base 60 Convex part 61 Concave part 62 Convex part 63 Locking claw 64 Opening

Claims (1)

[Claims] 1. A lens-fitted film unit having a structure in which plastic parts are connected to each other by claws, wherein one of the parts to be connected to each other is integrally formed with a resilient convex part. The film unit with a lens, wherein the projection is formed to have a protruding length that bends in contact with the other component facing when the claw is connected.