JP2000019604A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit with a lens in which the restriction of a molding material of a front cover is eliminated and the degree of freedom of design is widened. SOLUTION: A projection 55 with which a catch 56 formed at a lens presser 54 is engaged is projectingly formed at the outside circumferential wall surface of a shutter cover 52 and an aperture for removing the projection is not formed at the cover 52. The front surface of a shutter blade 26 is covered with the cover 52 without leaving a space. The circumference of an exposure window 25 is provided with a light shielding wall 58 extended up to an identical plane surface to the bottom surface of a shutter base 51 to shield external light entering from a coupling part between the base 51 and the cover 52. The optical path of photographing light passing through a photographing lens 3 is perfectly shielded by the cover 52, a light shielding barrel 57 and a dark box 19. Thus, it is unnecessary to provide light shielding property to the front cover covering the front surface of a main body base part 41 and a colored resin or a resin having transparency can be used as a molding material of the front cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light shielding structure of a film unit with a lens.

[0002]

2. Description of the Related Art Film units with lenses are commercially available so that photographers can easily enjoy photography at any time. This film unit with a lens is a unit with a simple photographing mechanism with a built-in unexposed photo film in advance. In general, it is widely used because of its simplicity.

FIG. 10 shows an example of a film unit with a lens. Film unit 1 with lens
Is constructed by winding an exterior label 2 around the center of the unit body 10. The unit body 10 is mainly made of plastic, and has a photographing lens 3 and a finder objective window 4 on the front, a shutter button 5, a winding knob 6, and a film counter window 7 on the upper surface, and a finder eyepiece window 8 on the back. Each is provided. The label 2 is used to make the appearance of the lens-fitted film unit 1 beautiful, and has a cosmetic print on the surface. A required portion of the label 2 is provided with an opening for exposing a photographing lens 3, a finder objective window 4, a film counter window 7, and a finder eyepiece window 8 provided in the unit body 10 to the outside. The photographing operation can be performed with the unit 2 wound around the unit body 10.

[0004] As shown in FIG.
The front cover 12 and the rear cover 1
3. On both sides of the main body base 11, a cartridge chamber 1 for housing the cartridge main body 14 is provided.
5 and a film roll chamber 17 for accommodating the photo film 16 in a roll form are provided integrally, and an aperture 18 for defining an exposure range of the photo film 16 is formed between them. . Aperture 18
A dark box 19 is provided on the front surface of the camera. An exposure unit 20 having an integrated photographing mechanism is attached to the front surface of the dark box 19, and is sandwiched between the front cover 12 and the rear cover 13. The photo film 16 includes the main body base 11 and the rear cover 1.
3 is stored light-tight.

[0005] As shown in FIG.
Is a unit in which a shutter mechanism, a finder optical system, a film winding mechanism, and the like are integrally assembled with a shutter base 21. A finder lens 22, a film counter board 23 and the like are attached to the upper part of the shutter base 21, and are fixed by a top plate 24. An exposure window 25 for regulating the optical path of the photographing light is formed on the front surface of the shutter base 21, and a shutter blade 26 and a shutter cover 30 holding the photographing lens 3 are attached to the front surface of the exposure window 25. . The shutter blade 26 is mounted on a shaft 27 implanted on the front surface of the shutter base 21.
It is rotatable between an open position where the exposure window 25 is opened and a closed position where the exposure window 25 is shielded. A return spring 28 is hung between the shutter blade 26 and the shutter base 21, and the shutter blade 26 is urged toward the closed position.

[0006] As shown in FIG.
Is provided with a lens holder 31 for holding the taking lens 3, and a lens holder 32 is put on the front surface of the lens holder 31. A protrusion 33 is provided on the outer peripheral wall of the lens holder 31, and a locking claw 34 that engages with the protrusion 33 is provided on a peripheral edge of the lens holder 32. On the front surface of the shutter cover 30, an opening 35 for punching out the protruding projection 33 is formed. When the lens holder 32 holding the photographing lens 3 is covered with the lens holder 32 and the projection 33 is engaged with the locking claw 34, the lens holder 32 is fixed to the front surface of the lens holder 31. Is pinched.

[0007] As shown in FIG.
An engagement protrusion 36 is provided on the side wall surface of the shutter cover 30. On the side wall of the shutter cover 30, a frame-shaped fixing claw 37 having an opening formed in a part of the wall surface is provided. The shutter cover 30 is put on the front surface of the shutter base 21 and
Is engaged with the fixing claw 37, the shutter cover 30 is fixed to the front surface of the shutter base 21.

[0008]

In the shutter cover 30 having the above structure, when the shutter cover 30 is put on the front surface of the shutter base 21, the opening 35 for punching is located on the front surface of the shutter blade 26, and a frame-shaped fixing member is provided. An opening for forming the claw 37 is located on the side of the shutter blade 26. For this reason, there is a risk that external light may enter the optical path of the photographing light passing through the photographing lens 3 from the opening 35 or the fixed claw 37 and cause fogging.

In order to solve such a problem, in a conventional film unit with a lens, a front cover 12 for covering the front surface of an exposure unit 20 is provided in addition to a main body base 11 for storing a photographic film 16 and a rear cover 13. A light shielding property is provided to prevent external light from entering the optical path of the photographing light. The front cover 12 and the rear cover 13 are generally formed of a light-shielding material, for example, a black opaque resin containing carbon black. However, since the front cover 12 constitutes the front surface of the film unit with the lens and is an important member that determines the appearance, the molding material and the surface color of the front cover 12 are restricted.
This hinders the selection of film units with lenses.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lens-fitted film unit capable of eliminating the restriction on the molding material of the front cover and expanding the degree of freedom in design.

[0011]

In order to achieve the above object, in a film unit with a lens according to the present invention, a photographic lens is positioned on a lens holder provided on a shutter cover, and is held with a front surface covered with a lens holder. The lens holder holds the locking claw provided on the periphery,
The shutter cover is fixed to the front surface of the lens holder by engaging with a projection provided on the outer peripheral wall surface of the shutter cover. In addition, on the front surface of the shutter base, a light-shielding wall is provided along the terminal edge of the shutter blade toward the closed position side and one end extends until reaching one end on the same plane as the bottom surface of the shutter base. It is preferable that the bottom surface of the shutter cover be in contact with the inner wall of the bottom surface of the shutter cover.

[0012]

FIG. 6 is an exploded view of a unit body of a film unit with a lens according to the present invention. The same members as those of the film unit with lens shown in FIGS. 10 to 14 are denoted by the same reference numerals. The unit main body 40 is configured by covering a front cover 42 and a rear cover 43 on the main body base 41 from front and rear. On both sides of the main body base 41, a cartridge chamber 15 for storing the cartridge main body 14 and a film roll chamber 17 for storing the photographic film 16 in a roll form are provided integrally. An aperture 18 for defining an exposure range of the photographic film 16 is formed between the cartridge chamber 15 and the film roll chamber 17, and a dark box 19 is provided in front of the aperture 18. Dark box 19
An exposure unit 50 is attached to the front surface of the camera, and is sandwiched between the front cover 42 and the rear cover 43.

The bottoms of the cartridge chamber 15 and the film roll chamber 17 are open, and are closed by pull-top type bottom covers 44a and 44b provided on the bottom side of the rear cover 43, respectively. A winding knob 6 is attached to the upper surface of the cartridge chamber 15, and a part thereof projects from an opening 45 formed in the rear cover 43.

As shown in FIG. 7, a thin portion 47 having a reduced thickness is formed at the opening edge of the upper wall of the cartridge chamber 15 in the main body base portion 41. The rear cover 43 is provided with a rib 48 protruding toward the inner wall and extending along the opening edge of the upper wall of the cartridge chamber 15. When the rear cover 43 is put on the rear surface of the main body base 41, the thin portions 47 and the ribs 48 overlap, and the main body base 41 and the rear cover 43 adhere to each other without a gap. As a result, external light incident from the opening 45 formed above the cartridge chamber 15 is prevented from entering the cartridge chamber 15, and the light-shielding property of the storage portion of the photographic film 16 is maintained.

In FIG. 6, an exposure unit 50 is a unit in which a shutter mechanism, a finder optical system, a film winding mechanism, and the like are integrally assembled with a shutter base 51. A finder lens 22, a film counter board 23, and the like are attached to an upper portion of the shutter base 51, and are fixed by a top plate 24. A shutter cover 52 holding the taking lens 3 is attached to a front surface of the shutter base 51.

As shown in FIGS. 1 and 2, the shutter cover 52 has a lens holder 53 for holding the taking lens 3, and a lens holder 54 is put on the front surface thereof. A plurality of protrusions 55 are provided on the outer peripheral wall surface of the shutter cover 52 so as to surround the lens holder 53, and a locking claw 56 that engages with each of the protrusions 55 is provided on a peripheral portion of the lens holder 54. . Then, when the taking lens 3 is inserted into the lens holder 53 and covered with the lens holder 54 and the engaging claw 56 is engaged with the projection 55, the lens holder 54 is fixed to the front surface of the lens holder 53, and between them. The taking lens 3 is held.

As shown in FIG. 3, the shutter base 51 is integrally provided with a light shielding tube 57, and an exposure window 25 for regulating the optical path of the photographing light is formed on the front surface of the light shielding tube 57. A shutter blade 26 that is rotatable between an open position for opening the exposure window 25 and a closed position for closing the exposure window 25 is attached to the front surface of the exposure window 25, and a shutter cover 52 is put on the front surface. . Exposure unit 50
Is mounted so as to close the open front side of the dark box 19 with the light shielding tube 57, and the light path of the photographing light is blocked by the light shielding tube 57 and the dark box 19.

As shown in FIG. 4, around the exposure window 25 formed in the shutter base 51, along the terminal edge toward the closed position side of the shutter blade 26, one end is the same as the bottom surface 51a of the shutter base 51. A light-shielding wall 58 extending to reach a plane is provided. The light-shielding wall 58 restricts the movement of the shutter blade 26 in the direction of the closing position, and the lower end 58 a abuts against the inner wall of the bottom surface of the shutter cover 52 (see FIG. 3). External light that has entered through the connecting portion is further blocked by the light shielding tube 5.
7 is prevented from entering.

As shown in FIG. 5, a pair of engaging projections 61 and 62 are provided on the side wall surface of the shutter base 51 so as to protrude. A pair of fixing claws 63 and 64 are provided on the side wall of the shutter cover 52 so as to protrude from the edge. Cover the front of the shutter base 51 with the shutter cover 52,
When the fixing claws 63, 64 are engaged with the engaging projections 61, 62, the shutter cover 52 is fixed to the front surface of the shutter base 51.

In the process of assembling the exposure unit 50,
First, the finder lens 2 is provided above the shutter base 51.
2 and a film counter board 23 are attached,
Fixed by

On the other hand, the taking lens 3 is held in a lens holder 53 provided on a shutter cover 52, and a lens holder 54 is put on the front surface. Then, when a locking claw 56 provided on a peripheral portion of the lens holder 54 is engaged with a projection 55 projecting from an outer peripheral wall surface of the shutter cover 52,
The lens holder 54 is fixed to the front surface of the lens holder 53, and the taking lens 3 is held between these. On this occasion,
Since the outer peripheral wall of the lens holder 54 covers the outer peripheral wall of the lens holder 53 over the entire circumference, external light does not enter the lens holder 53 from this overlapping portion, and the inside of the shutter cover 52 is reliably shielded from light. You. Since the projection 55 for fixing the lens holder 54 to the front surface of the lens holder 53 is provided on the outer peripheral wall surface of the shutter cover 52, it is not necessary to form an opening for projecting the projection on the shutter cover 52.

Next, the shutter blades 26 are attached to the front surface of the shutter base 51, and the shutter cover 52 holding the photographing lens 3 is put on the front surface. The engagement projections 61 and 6 projecting from the side wall surface of the shutter base 51 are provided.
2, a fixed claw 6 provided on a peripheral portion of the shutter cover 52.
When the shutters 3 and 64 are engaged, the shutter cover 52 is fixed to the front surface of the shutter base 51, and the exposure unit 50 is completed.

As described above, since the shutter cover 52 is not provided with an opening for projecting a die, the front surface of the shutter blade 26 is covered by the shutter cover 52 without any gap. Further, since the outer peripheral wall of the shutter cover 52 is superimposed on the outer peripheral wall of the shutter base 51, the shutter base 51 and the shutter cover 52 are connected without any gap, and external light can enter the shutter base 51 from this connection portion. There is no. Further, on the front surface of the shutter base 51, a light-shielding wall 58 surrounding the exposure window 25 and extending until reaching the same plane as the bottom surface 51a of the shutter base 51 is provided. Because of the contact, even if external light invades from the connecting portion between the shutter base 51 and the shutter cover 52, the light path of the invading light is blocked by the light shielding wall 58. Thus, the optical path of the photographing light is reliably blocked in the exposure unit 50.

The exposure unit 50 assembled as described above is transferred to the assembling step of the unit main body 40 and is assembled on the front surface of the dark box 19 provided on the main body base 41. Thereafter, the hoisting knob 6 is attached to the upper wall of the cartridge chamber 15, and the front cover 4
2 and the rear cover 43 are covered. Then, the photo film 16 which is all pulled out from the cartridge main body 14 and formed into a roll is stored in the film roll chamber 17 and the cartridge main body 14 is stored in the cartridge chamber 15, respectively.
When the bottom lids 44a and 44b are closed, the unit body 40
Is completed.

In the unit main body 40, the thin portion 47 formed on the upper wall of the cartridge chamber 15 of the main body base 41 and the rib 48 projecting from the inner wall of the rear cover 43 overlap each other, and the upper wall of the cartridge chamber 15 is sealed. Is done. This prevents external light from entering the cartridge chamber 15 from the opening 45 formed above the cartridge chamber 15, and the photographic film 16 is stored in a light-tight manner between the main body base 41 and the rear cover 43. You.

Also, a lens holder 53 and a lens holder 54, a shutter base 51 and a shutter cover 52
Are connected without forming a gap, and the light shielding property in the exposure unit 50 is secured, so that the optical path of the photographing light passing through the photographing lens 3 is completely blocked by the exposure unit 50 and the main body base 41. . Therefore, the front cover 42 does not need to have a special light shielding property,
As the molding material, for example, a colored resin or a resin having transparency can be used. This allows
A large number of film units with lenses having different appearances can be configured, and the product lineup can be expanded.

In the above embodiment, the thin portion 4
Although the example in which the outside light is prevented from entering the cartridge chamber 15 from the connection portion between the main body base 41 and the rear cover 43 by overlapping the ribs 7 and the ribs 48 has been described, for example, as shown in FIG. A groove 67 is formed on the opening edge of the upper wall of the chamber 15, and a rib 68 extending along the opening edge of the cartridge chamber 15 is formed on the inner wall of the rear cover 43.
And the rib 68 may be fitted into the groove 67. According to this embodiment, since the connecting portion between the main body base 41 and the rear cover 43 overlaps on two surfaces of the upper surface and the lower surface of the rib 68, compared with the first embodiment in which only one surface overlaps. Thus, the inside of the cartridge chamber 15 can be more reliably shielded from light.

As shown in FIG. 9, for example, a frame base fixing claw 71 is provided at the edge of the outer peripheral wall of the shutter cover 70, and this fixing claw 71 is connected to the shutter cover. The shutter 70 may be bent in a direction protruding from the outer peripheral wall so as to get over and engage with the engaging projection protruding from the wall surface of the shutter base. Also in this case, the fixing claw 71 is provided so as to protrude from the edge of the outer peripheral wall of the shutter cover 70 so that the outer peripheral wall of the shutter cover 70 can be superimposed over the entire outer peripheral wall of the shutter base. It is important to prevent external light from entering the shutter base from these connecting portions.

[0029]

As described above, according to the film unit with the lens of the present invention, the lens unit engages with the locking claw of the lens holder,
Since a projection for fixing the lens retainer to the front surface of the lens holder is provided on the outer peripheral wall surface of the shutter cover, it is not necessary to form an opening for projecting the projection on the shutter cover. As a result, the front surface of the shutter blade is completely covered by the shutter cover. Further, a light shielding wall is provided on the front surface of the shutter base along the terminal edge of the shutter blade toward the closed position side, and one end of the light shielding wall extends until it reaches the same plane as the bottom surface of the shutter base. If it is in contact with the inner wall of the bottom of the cover, even if external light intrudes from the joint between the shutter base and the shutter cover, the light path of the invading light is blocked by the light-shielding wall, and the light-shielding property in the exposure unit is secured. Is done. Therefore, the optical path of the photographing light that has passed through the photographing lens is completely blocked between the exposure unit and the main body base, so that it is not necessary to impart light blocking to the front cover that covers the front surface of the exposure unit. Thereby, since there is no restriction on the molding material of the front cover, it is possible to mold using, for example, a colored resin or a resin having transparency, and it is possible to configure a large number of film units with lenses having different appearances. .

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a shutter cover of an exposure unit incorporated in a film unit with a lens according to the present invention.

FIG. 2 is a front view of a shutter cover shown in FIG.

FIG. 3 is a sectional view of a main part of an optical path of photographing light passing through a photographing lens.

FIG. 4 is a schematic view showing a mounting portion of a shutter blade.

FIG. 5 is a schematic view showing a connecting portion between a shutter base and a shutter cover.

FIG. 6 is an exploded perspective view of a unit main body of the film unit with a lens according to the present invention.

FIG. 7 is a schematic diagram illustrating a configuration of a connecting portion between a main body base and a rear cover in an upper wall portion of the cartridge chamber.

FIG. 8 is a schematic diagram showing another configuration of a connecting portion between the main body base and the rear cover in the upper wall portion of the cartridge chamber.

FIG. 9 is a schematic diagram illustrating another configuration of a connecting portion between a shutter base and a shutter cover.

FIG. 10 is an external view of a film unit with a lens.

FIG. 11 is a sectional view of a main part showing a configuration of a unit main body.

FIG. 12 is an exploded perspective view of a conventional exposure unit.

FIG. 13 is a schematic diagram illustrating a configuration of a shutter cover unit illustrated in FIG. 12;

FIG. 14 is a schematic diagram of a main part showing a connecting portion between a shutter base and a shutter cover shown in FIG. 12;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film unit with a lens 3 Photographing lens 10, 40 Unit main body 11, 41 Main body base 12, 42 Front cover 13, 43 Rear cover 14 Cartridge 15 Cartridge chamber 16 Photographic film 17 Film roll chamber 20, 50 Exposure unit 21, 51 Shutter base 26 Shutter blade 30, 52, 70 Shutter cover 31, 53 Lens holder 32, 54 Lens holder 33, 55 Projection 34, 56 Locking claw 47 Thin portion 48, 68 Rib 61, 62 Engagement protrusion 63, 64, 71 Fixed claw 67 Groove

Claims (2)

[Claims] A shutter blade rotatable between an open position for opening a photographing optical path and a closed position for blocking a photographing optical path is mounted on a front surface of a shutter base in which a photographing mechanism is integrally mounted, and further, photographing is performed. An exposure unit having a shutter cover holding a lens is assembled to the front surface of the main body base, and a film unit with a lens is provided with a front cover and a rear cover so as to cover the main body base from front and rear. The lens holder is positioned on a lens holder provided on the cover, and is held with a lens holder on the front surface.The lens holder is provided with a locking claw provided on a peripheral portion of the lens holder on a projection protruding from an outer peripheral wall surface of the shutter cover. A film unit with a lens, wherein the film unit is fixed to a front surface of the lens holder by being engaged. 2. A light-shielding wall is provided on a front surface of the shutter base, the light-shielding wall extending along an end edge toward a closed position side of the shutter blade and extending at one end to be flush with a bottom surface of the shutter base. 2. The lens-fitted film unit according to claim 1, wherein the lower end portion is in contact with an inner wall of a bottom surface of the shutter cover which covers a bottom surface of the shutter base.