JP2781487B2 - Film unit with lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit having a built-in film and a photographic lens and a shutter mechanism.

[0002]

[Prior art] "Sha-run is high", "Sha-run is flash", "Sha-run is panorama" (all product names)
The film unit with a lens is generally used widely because it can be used for taking a picture immediately at the place of purchase, and after the photographing, it is easy to put it out to a processing dealer. At the photo lab, the photographed film is taken out of the film unit with the lens, and the film is developed and printed, and the print photograph and the negative film are returned to the user. From such usage, the cost of the lens-fitted film unit is required to be low, and in order to satisfy this requirement, mass production by automatic assembly is performed.

The above-mentioned film unit with a lens comprises a unit body having a built-in film and a shutter and other main photographing mechanisms, and a paper box for makeup put on the surface thereof. Further, the unit main body includes a patrone chamber for accommodating a patrone and a film roll, a film roll chamber, a main body having an aperture formed between the two chambers, a front cover for covering a front surface of the main body,
And a rear cover that covers the back of the main body.

[0004] A shutter unit is incorporated in the unit main body, thereby exposing a film positioned at the aperture to light. As is well known, the shutter unit charges the shutter with a sprocket that rotates while engaging with the perforation of the film, and stops the film feed at the time of each frame feed. When the film is fed by one frame, the number-of-photographs display plate is rotated by one tooth by the cam formed on the sprocket shaft, and the current number of remaining images is displayed from the counter window.

By the way, in order to display the number of remaining images accurately, it is necessary to mount the number-of-photographs display plate at an initial position. For this reason, conventionally, a triangular mark, which is a start mark, is detected by a photoelectric sensor. However, since there is a play between the number-of-photographs display plate and a cam for rotating the same by one tooth, the start mark 1 If only the location is detected, the number-of-photographs display plate moves within the range of the play, and the sensor does not turn on although it is the initial position, or the sensor turns on even if it is not the initial position. There are inconveniences. Therefore, conventionally, as shown in FIG. 6, two points P1 and P2 of the upper side L1 and the lower side L2 of the triangular mark M1 are divided into two photoelectric sensors S1 and S2.
, And when both sensors S1 and S2 are turned on, the initial position of the number-of-photographs display plate C1 is detected, thereby eliminating the influence of the play.

[0006]

However, in the above-mentioned conventional method, it is necessary to detect isosceles of an isosceles triangle whose vertex is an acute angle with two photoelectric sensors. It is necessary to set the number of sensors.
For this reason, there is a problem that the positioning of the two sensors is very difficult.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a film unit with a lens capable of easily detecting the initial position of the number-of-photographs display plate.

[0008]

In order to achieve the above object, according to the present invention, the number-of-photographs display plate is rotated by a predetermined angle corresponding to the frame advance of the film so that the number of photographed images can be confirmed from the counter window. In the film unit with a lens, two initial position detection marks are formed on the surface of the number-of-photographs display plate at positions substantially point-symmetric with respect to the rotation center within a range invisible from the counter window.
The mark for use is provided away from the center of rotation .

In another aspect of the present invention, a first mark for detecting an initial position is formed on the surface of the number-of-photographs display plate in a range that cannot be seen from the counter window. A second mark for initial position detection is formed at a position slightly deviated in the rotational direction from the point symmetric position about the rotation center of the center, and the initial position detection mark is separated from the rotation center.
It is provided .

[0010]

FIG. 2 shows a film unit with a lens (hereinafter simply referred to as a film unit) according to the present invention. The film unit 2 includes a unit body 3 including a photographing mechanism, for example, a photographing lens 5, a finder 6, a shutter button 7, a photograph number display plate 8, a winding knob 9, a strobe light emitting unit 10, and a charging knob 11, and houses the unit. And a paper box 4 on which decorative printing is performed. The unit main body 3 includes a main body, a front cover and a rear cover fixed to the front and rear of the main body, and accommodates a film with a patrone therein.

In FIG. 3, which is an exploded view of the main part of the unit main body, an exposure chamber 21 is provided at the center of the main body 20, and a film chamber 22 and a cartridge chamber 23 are provided at both ends so as to sandwich the exposure chamber 21. Are formed integrally with each other.
A shutter unit 24 and a flash unit 25 are hooked on the front surface of the main body 20.

The shutter unit 24 includes a unit base 26 having an exposure opening, a shutter cover 27 for holding the photographing lens 5, and shutter blades 28. The shutter blade 28 includes the unit base 26 and the shutter cover 2.
7 to open and close the exposure opening.

FIG. 4 shows a shutter unit, and an exposure opening 31 is formed in the center of the front surface of the shutter unit 24. A stopper 32 is provided on the right side of the exposure opening 31. The stopper 32 comes into contact with the shutter blade 28 which is rotated counterclockwise by a spring 33, and is located at a position where the exposure opening 31 is shielded. Stop. The shutter blade 28 is formed of a light-shielding plastic and includes a claw 28a pressed by a shutter drive lever described later and a pressing portion 28b. Pressing part 28b
As shown in FIG. 3, the flash unit 35 of the contact unit 34 is pressed to bring the flash units 35 and 36 into contact with each other so that the flash unit 10 emits light.

Further, on the upper part of the shutter unit 24,
Shafts 50 and 51 and a bearing 52 are formed. Axis 50
Has a number-of-photographs display plate 8 and a shutter drive lever 53a.
Drive cam 53 having a cam arm 53b
A locking lever 55 urged clockwise by a spring 54 is fitted into the shaft 51. The locking lever 55 is normally engaged with a shutter driving lever 53a urged in a counterclockwise direction by a spring 54 to prevent the rotation of the shutter driving cam 53. The engagement with the lever 53a is released. When the engagement with the locking lever 55 is released, the shutter drive lever 53a is rotated counterclockwise by the spring 54,
The claw 28a of the shutter blade 28 is pressed. The shaft of a cam 56 that engages with the locking lever 55 is inserted through the bearing 52. A driven sprocket 57 rotated counterclockwise when the film is wound is engaged with this shaft. When the film is wound up, the cam 56 rotates counterclockwise to return the shutter drive lever 53a to the charge position via the cam arm 53b formed on the shutter drive cam 53, and to display the number-of-photographs display plate 8 Is rotated by one division.

As shown in FIG. 1, the number-of-photographs display plate 8 is formed with a number sequence 60 representing the number of remaining images along the circumferential direction, as is well known, and a counter formed on the front cover. By displaying this number string 60 from the window 61,
It is possible to check the current number of remaining images. The number-of-photographs display plate 8 is provided with two marks 62 and 63 for detecting the initial position, in addition to the numeral string 60. These marks 62 and 63 are formed in a rectangular shape, and are provided at a position inside the numeral string 60 and at a point symmetric position about the rotation axis 65 so that they are not exposed from the counter window 61. . These marks 6
As in the case of the numeral string 60, the numerals 2 and 63 are formed in a relief shape by die molding, and the upper surface thereof is coated with a white paint to improve the visibility of numerals and the like.

At the time of assembling the shutter unit 24, the initial position of the photographing number display plate 8 is detected as described below.
Assembled as it appeared in 1. First, in a state where the number-of-photographs display plate 8 is set at the initial position, photoelectric sensors 70 and 71 for detecting the marks 62 and 63 are arranged at positions corresponding to the marks 62 and 63 of the number-of-photographs display plate 8. Further, a display plate rotating gear 72 that rotates to set the number display plate 8 to the initial position is arranged, and the rotating gear 72 is meshed with the gear 8 a of the number display plate 8. A motor 73 is connected to the rotating gear 8a,
Thereby, the number display plate 8 is rotated. And the above 2
When the photoelectric sensors 70 and 71 are turned on, the motor 73 is stopped, and the number-of-photographs display plate 8 is set to the initial position. As described above, since the two marks 62 and 63 are formed on the number-of-photographs display plate 8 at point-symmetric positions with respect to the rotation axis 65, the two marks 62 and 63 can be arranged as far apart as possible. it can. Thereby, these marks 62, 63
Since the photoelectric sensors 70 and 71 arranged corresponding to the image sensor can be attached sufficiently apart from each other, the photoelectric sensors S1 and S2 are attached in a state where the photoelectric sensors S1 and S2 are close to each other as in a conventional display panel C1 shown in FIG. This eliminates the necessity, and the mounting and position setting of the photoelectric sensors S1 and S2 can be easily performed.

The thus configured film unit 2
The operation of will be described. When the shutter button 7 is pressed, the locking lever 55 is rotated counterclockwise in FIG. 4, and the locking of the shutter driving lever 53a is released. Thereby, the shutter blade 2 is moved by the shutter drive lever 53a.
8 is kicked off, and the shutter blade 28 opens the exposure opening 31. Thereafter, when the shutter drive lever 53a gets over the claw portion 28a, the shutter blade 28
By the bias of 3, the exposure opening 31 is returned in the closing direction.
This completes the shooting of one frame. As shown in FIG. 4, the shutter drive lever 53a is
When b contacts the cam 56, its rotation is stopped.

After the photographing, the winding knob 9 is turned,
When the film is wound up, the driven sprocket 57 is rotated counterclockwise. As a result, the cam 56 makes one rotation in the counterclockwise direction, and rotates the gear 8a of the number-of-photographs display plate 8 by one tooth via the one-tooth feed cam portion 56a. As a result, the number of displayed images in the counter window 61 is reduced by “1”, and the current number of remaining images is displayed. The rotation of the cam 56 in the counterclockwise direction causes the cam arm 53b to rotate.
, The shutter drive cam 53 rotates clockwise. By this rotation, the shutter drive lever 53a returns to the charge position, and the preparation for the next photographing is completed. The shutter drive lever 53a abuts on the claw 28a during the return, but the claw 2 is pressed by the shutter drive lever 53a.
8a bends downward, and the shutter drive lever 53a itself deforms upward to get over it. Of course, claw 2
It is possible to return the shutter drive lever 53a to its original position only by bending the shutter 8a.

In the above embodiment, two marks 6
2 and 63 are mounted at point-symmetric positions with respect to the rotation shaft 65, that is, at positions 180 ° apart in the circumferential direction. This is based on the position of the start mark 66 when attaching the number display plate 8 to the shaft 65, so that the number display plate C1 is always at a constant position in the rotation direction. Because. However, when the start mark 66 is not set at a fixed position and is random at the time of assembly, it is necessary to make a maximum of one rotation when setting the number display plate 8 to the initial position. In this case, if the two marks 62 and 63 are formed at point symmetrical positions as shown in FIG. 1, the initial positions are detected at two places during one rotation. In order to prevent this, a number-of-photographs display plate 80 as shown in FIG. 5 is used.
In the number-of-photographs display plate 80, one mark 81 is provided at a position shifted from the point symmetric position of the other mark 82 with respect to the rotation axis 79 by about 10 ° to 30 ° in the circumferential direction. In this case, even if the number-of-images display plate 8 is rotated once, both the photoelectric sensors 83 and 84 are turned on at only one position of the initial position. There is no detection.

In the above embodiment, each of the marks 62, 6
Although 3, 81 and 82 are rectangular, they may be round or wedge-shaped. Further, a linear mark provided in the radial direction may be used. In addition, one of the marks may be a start mark. In this case, only one mark needs to be newly provided in comparison with the conventional mark. In addition, each mark 6
Although the reference numerals 2 and 63 are provided inside the number string 60, they may be formed outside the number string 60 at a position invisible from the counter window 61. The marks 62, 6 on the number-of-photographs display plate 8
If a through hole is provided at the same position as 3,
The return of the emitted light is detected by a reflective photoelectric sensor.
Or the light passing through the through-hole
Sensor.

[0021]

As described above, according to the present invention,
Two initial position detection marks were formed on the surface of the number-of-photographs display plate at positions almost symmetrical with respect to the center of rotation within a range invisible from the counter window. It is not necessary to set the initial position by detecting the isosceles of the isosceles triangle, and it is possible to mount the photoelectric sensor for detecting the mark at a remote position. This makes it easy to mount and adjust the position of the photoelectric sensor.

A first mark for detecting the initial position is formed on the surface of the number-of-photographs display plate in a range that cannot be seen from the counter window. Since the second mark for initial position detection is formed at a position slightly deviated in the rotation direction from the point symmetrical position, even if the start mark is not fixed at the time of assembly and is random, the initial position is ensured. Can be detected. That is, when the number-of-photographs display plate is set to the initial position when the position of the start mark is random at the time of assembly, it is necessary to rotate the number-of-photographs display plate by a maximum of one turn. Since only one initial position is detected, erroneous detection of the initial position is eliminated.

[Brief description of the drawings]

FIG. 1 is a plan view showing a number-of-photographs display plate of a film unit with a lens according to the present invention.

FIG. 2 is a perspective view showing an appearance of the lens-fitted film unit.

FIG. 3 is an exploded perspective view showing a main part of a unit main body.

FIG. 4 is an exploded perspective view showing a shutter unit.

FIG. 5 is a plan view showing a number-of-photographs display panel of another embodiment.

FIG. 6 is a plan view showing a conventional photograph number display panel.

[Explanation of symbols]

 3 Unit main body 8,80 Number of shots display plate 24 Shutter unit 28 Shutter blade 28a Claw 28b Pressing part 60 Numerical string 61 Counter window 62,63,81,82 Mark 65 Rotating axis 66 Start mark 70,71,83,84 Photoelectric Sensor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-272238 (JP, A) JP-A-3-83048 (JP, A) Fully open 1986-112327 (JP, U) Really open 1988 148933 (JP, U) Hira 2-33042 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03C 3/00 G03B 43/00 G03B 17/36 G06B 1/66

Claims (2)

(57) [Claims] 1. A film unit with a lens, wherein a number-of-photographs display plate is rotated by a predetermined angle every time the film is fed, so that the number of photographed images can be confirmed from a counter window.
Two marks for detecting the initial position are formed on the surface of the number-of-photographs display plate at positions substantially symmetrical with respect to the center of rotation within a range invisible from the counter window.
The film unit with lens is characterized in that it is located away from the center of rotation . 2. A film unit with a lens, wherein the number-of-photographs display plate is rotated by a predetermined angle each time the film is fed, so that the number of photographed images can be confirmed from a counter window.
A first mark for initial position detection is formed on the surface of the number-of-photographs display plate in a range that cannot be seen from the counter window, and point symmetry with respect to the first mark about the rotation center of the number-of-photographs display plate. A second mark for initial position detection is formed at a position slightly deviated in the rotation direction from the position, and the second mark for initial position detection is formed .
Mark is provided away from the center of rotation .