JP3308404B2 - 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 lens-equipped film unit which can automatically perform film winding and shutter charging by mounting a film winding device.

[0002]

2. Description of the Related Art A simple photographing mechanism is provided so that anyone can easily enjoy photographing.
2. Description of the Related Art A film unit with a lens in which a 135 type film with a patrone specified in 1979 is pre-loaded is well known. This film unit with a lens draws out all the film from the patrone and winds it in a roll shape, and stores the film roll and the patrone in a storage room.

After the photographing, the film is wound on the spool by rotating a winding knob connected to the spool of the cartridge. The driven sprocket is rotated by the movement of the perforation of the film, and the stop cam and the charge cam are rotated coaxially with the driven sprocket, and the release lever slidingly contacting the charge cam is returned to the shutter set position. A tooth row having a triangular cross section is formed on the outer circumference of the winding knob. When the film is fed by one frame, the hook of the locking lever enters the tooth row of the winding knob, and rotation of the winding knob is inhibited.

In a film unit with a lens, the film is fed and the shutter is charged in accordance with the turning operation of the winding knob. For this reason, if the rotation operation of the winding knob is forgotten after the photographing, the photographing becomes impossible at the time of the next photographing, and a shutter chance may be missed. In order to solve such a problem, Japanese Unexamined Patent Publication No. Hei 5-297441 discloses a connecting gear that meshes with a tooth row of a hoisting knob when the film is attached to a film unit with a lens, and drives the connecting gear. A film winding device including a motor has been proposed.

[0005]

As described above, since the tooth row of the winding knob has a triangular cross section, the meshing with the connecting gear is shallow, so that the winding of the film at the start of film winding when the driving torque of the motor is suddenly increased. When the rotation of the gear is mechanically prohibited by the locking lever, tooth missing or tooth skipping may occur. Also, noise is generated when the film is wound, which is annoying.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a lens-fitted film unit which does not cause tooth skipping or chipping due to a sudden change in driving torque of a motor. And

[0007]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, the drive of the external winder is coaxial with the winding knob so as to be coaxial with the first tooth row with which the winding lever is engaged. A second tooth row meshing with the gear tooth row is integrally formed,
When the external winder is mounted, the drive gear of the external winder is made to mesh with the second dentition. Therefore, even if a sudden change in the motor drive torque occurs, tooth skipping or tooth missing does not occur. . In the invention according to claim 2,
The first dentition and the second dentition are provided adjacent to each other in the axial direction.

[0008]

FIG. 2 shows an example of a film unit 2 with a lens and a film winding device 3 mounted on the film unit 2 according to the present invention.
Is composed of a unit main body 4 in which various devices are incorporated, and a paper box 5 surrounding the unit main body 4 and having an opening for exposing each part.

On the front side of the unit body 4, a photographing lens 6 is exposed almost in the vicinity of the center. A finder device 7 for checking a photographing range is provided above the photographing lens 6. On the side of the finder device 7, there is provided a strobe light emitting section 8 constituting a strobe device.
Below this, a charge start switch 9 for charging the strobe device is arranged.

A shutter button 11 for performing shutter release, a remaining film number display window 12 for displaying the remaining number of films, and a charge confirmation window 13 for confirming charging of the flash device are provided on the upper surface of the unit body 4. Is provided.

The film winding device 3 is mounted on the end of the film unit with lens 2 on the grip 16 side.
The film winding device 3 includes an upper cover 41 provided with a release button 40, a lower cover 42 in contact with a lower surface of the lens-fitted film unit 2, and a main body disposed between the upper cover 41 and the lower cover 42. 43, which are formed of plastic. An opening 44 into which the end of the lens-fitted film unit 2 is inserted is formed on the side of the main body 43. A switch 71 that is turned on by being pushed by the film unit with a lens when the film unit with a lens 2 is inserted is provided on the inner surface of the opening 44 (see FIGS. 1 and 4).

The unit body 4 is, as shown in FIG.
Main body base 22, exposure unit 23, strobe unit 2
4, a patrone 25 and a film 26, a front cover 27 and a rear cover 28.

On the front surface of the main body 22, a patrone chamber 32 and a film roll chamber 33 are formed on both sides of an exposure frame 31 disposed on the optical axis 30, and after the patrone 25 and the film 26 are stored in each, respectively. The rear cover 18 is attached from behind the main body base 22 to make the rear cover 18 light tight.
The shutter button 11 is formed integrally with the front cover 27. A portion located in front of the patrone storage chamber 32 has a shape protruding along the contour thereof, and the outer wall of the protruding portion serves as the grip 16 and is held during photographing.

A row of teeth 37 and a row of teeth 38 are integrally formed vertically on the outer periphery of the winding knob 36 so as to be adjacent to each other in the axial direction. The hoisting knob 36 is rotatably mounted immediately above the patrone chamber 32. These are exposed on the back side of the unit body 4 so as to be able to rotate. Since the tooth row 37 has a triangular cross section, the film can be securely stopped when the claw 50a of the locking lever 50 enters. The tooth row 38 is formed integrally with an involute tooth profile and reliably meshes with the connecting gear 23 of the film winding device 3. Therefore, the driving force of the film winding device 3 can be efficiently transmitted without impairing the function of the winding knob 36.

The exposure unit 23 has a shutter mechanism and a film winding mechanism, and is mounted on the front surface of the main body 22. 1 by moving one frame of film
A rotating driven sprocket, and a locking lever 50 which rotates coaxially with the driven sprocket and winds one frame of film.
And a locking lever 50 that rotates counterclockwise at the end of the winding of one frame of the film, and makes the claw 32a enter the teeth 37 of the winding knob 36 to inhibit the rotation of the winding knob 36. And a spring for urging the locking lever 50 counterclockwise.

The internal structure of the film winding device 3 is shown in FIG.
As shown in FIG. 4, a driving means comprising a shutter release plate 61 and a switch 66, a driving stopping means comprising a clutch gear 63 and the switch 66, and a clutch means comprising a clutch gear 63 and a disk 62. Become.

The connecting gear 64 has a tooth row 64c formed in an involute tooth form. The tooth row 64c meshes with the tooth row 38 of the hoisting knob 36, and a shaft 64a is integrally formed at the center of rotation. A shaft portion 64b having a larger diameter is integrally formed on the shaft 64a above the connecting gear 64, and a clutch gear 63 is inserted into the shaft portion 64b so as to rotate and move freely. It is inserted.
A spring 67 is inserted through the shaft 64a, and the claws 63a formed on the upper surface of the clutch gear 63 are urged toward the disc 62 by pressing the clutch gear 63 toward the disc 62. The drive of the motor 70 is transmitted to the connection gear 64 by meshing with the three claws 62 a formed integrally on the lower surface.

A shutter release plate 61 is disposed above the disk 62, and the release button 40 is formed integrally with the shutter release plate 61. A push pin 61a for pushing the shutter button 11 is formed at the tip. When the release button 40 is pressed, the shutter button 11 is pressed by the pressing pin 61a to perform photographing, and the shutter release plate 6 is pressed.
1 depresses the clutch gear 63 to separate the clutch gear 63 from the disk 62. When the clutch gear 63 is depressed, the switch lever 66a of the push-push type switch 66 is pushed into the housing 66b and the internal contact is turned off.

When the finger is released from the release button 40 and the release button 40 returns to its original position, the clutch gear 63 comes into contact with the disk 62 against the spring 67,
Accordingly, the switch lever 66a protrudes as shown in FIG. 1, the internal contact is turned on, and the motor 70 is driven.

The operation of the above configuration will be described. When the film winding device 3 is mounted, the switch 71 is in the off state, and the switch 66 is set to the claw 63a of the clutch gear 63.
Is not engaged with the claw 62a of the disk 62 and is in the off state. The film unit with lens 2 is mounted after the film is wound up in advance. Film winding
A finger is put on the winding knob 36 to perform a rotating operation. Since the winding knob 36 has a large thickness, no winding error due to slanting play occurs.

When the film winding device 3 is mounted while the film is wound, the teeth 64c of the connecting gear 64 and the teeth 38 of the winding knob 36 mesh with each other, and the state shown in FIG. 1 is obtained. By being mounted on the film unit 2 with the lens, the switch lever 71a is pressed and the switch 71 is turned on.

When photographing, first, the release button 4
Press 0. When the release button 40 is depressed, the shutter release plate 61 depresses the clutch gear 63, and the depressing pin 61a depresses the shutter button 11 of the lens-fitted film unit 2 to operate the shutter mechanism, thereby exposing the film 26. Will be

When the finger is released from the release button 40 and the release button 40 returns, the switch lever 66a of the switch 66 returns and the switch 66 is turned on, and the claw 63a of the clutch gear 63 62
meshes with a. The drive of the motor 70 is started by the return of the switch lever 66a. The driving force of the motor 70 is
The transmission is transmitted to the gears 70a, gears 75, 76, gears 77, 78, and the clutch gear 63, and the winding knob 36 is rotated in the film winding direction.

When the winding knob 36 is rotated, the film 26 is transferred and wound on the spool 25. The driven sprocket is rotated by the movement of the perforation of the film 26, the winding cam and the charge cam are rotated coaxially with the driven sprocket, and the release lever that slides on the charge cam is returned to the shutter set position. When the film is advanced by one frame, the pawl 50a of the locking lever 50 is moved up by the winding knob 36.
And the rotation of the hoisting knob 36 is prohibited.

When the rotation of the winding knob 36 is mechanically locked in this way, a sudden load is applied to the meshing portion between the tooth row 38 and the tooth row 64c. Sliding occurs between the pawls 63a and the pawls 62a, and the clutch gear 63 moves downward, whereby the engagement with the disk 62 is released. When the clutch gear 63 moves, the switch lever 66a is pushed in, the switch 66 is turned off, and the driving of the motor 70 is stopped. Dentition 64
Since both the teeth c and the teeth 38 connected thereto are formed as involute teeth, when the motor 70 starts to drive and the driving torque of the motor suddenly rises, or when the film wind-up mechanism is activated, the film is stopped. Even when an abrupt load is applied to the connecting gear 37, there is no occurrence of tooth skipping or tooth missing. Also, since the rotation is smooth, the noise when winding the film is smaller than before.

FIG. 5 shows a hoisting knob 81 provided with a tooth row 81a having a larger diameter and a triangular cross section on a tooth row 81b formed in an involute tooth profile. FIG. 6 shows an example in which a hoisting knob 82 having a tooth row 82b having a larger diameter and a triangular cross section is used below a tooth row 82a formed as an involute tooth profile. 5 and 6
The same symbols are given to components having the same functions as those of the above-described embodiment.

In the above embodiment, the rotation of the connecting gear is transmitted to the hoisting knob by meshing the spur gears having the involute tooth profile. A spiral helical gear, bevel gear, or the like may be used.

[0028]

As described above, in the film unit with a lens according to the present invention, the winding knob engages with the drive gear of the external winder coaxially with the first tooth row with which the stop lever engages. Are integrally formed, and when the external winder is mounted, the drive gear of the external winder is meshed with the second tooth row. Therefore, even if a sudden change in the motor drive torque occurs, the tooth jump occurs. This eliminates the occurrence of chipping and tooth breakage, thereby greatly improving durability and reliability.

[Brief description of the drawings]

FIG. 1 is a cutaway view showing a state in which a film unit with a lens according to the present invention is mounted on a film winding device.

FIG. 2 is a perspective view showing a film unit with a lens and a film winding device mounted on the film unit.

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

FIG. 4 is an explanatory diagram showing an internal configuration of the film winding device.

FIG. 5 is a cutaway view showing a lens-fitted film unit using a winding knob in which a tooth row operated by a finger is formed on a lower side.

FIG. 6 is a cutaway view showing a film unit with a lens using a winding knob in which a tooth row on a side operated by a finger is formed on an upper side.

[Explanation of symbols]

 2 Film unit with lens 3 Film winding device 36 Winding knob 37, 38 Tooth row 50 Lock lever

Continuation of front page (56) References JP-A-6-82976 (JP, A) JP-A-5-232557 (JP, A) JP-A-6-175292 (JP, A) JP-A-6-230522 (JP) JP-A-7-244321 (JP, A) JP-A-1-166328 (JP, U) JP-A-63-76832 (JP, U) JP-A-63-150933 (JP, U) Registered utility model 3004841 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 17/04 G03B 17/00 G03C 3/00 575

Claims (2)

(57) [Claims] The film is fed by rotating a wind-up knob provided so as to be operable externally in the film winding direction, and when one frame of the film has been fed, a winding stop lever is formed on the outer periphery of the wind-up knob. A film unit with a lens, wherein the cross section is engaged with a tooth row having a triangular shape so as to prohibit the rotation operation of the winding knob, wherein the first tooth row with which the winding stopper engages with the winding knob is provided. A second tooth row that meshes with the drive gear of the external winder is formed coaxially, and the drive gear of the external winder is meshed with the second tooth row when the external winder is mounted. Film unit with lens. 2. The lens-fitted film unit according to claim 1, wherein the first tooth row and the second tooth row are provided adjacent to each other in the axial direction.