JPH0527315A - Camera - Google Patents

Abstract

PURPOSE:To prevent the double exposure of a film from occurring because the display of the using state of a film is inadvertently read. CONSTITUTION:A discrimination means which reads the rotational state of a rotation display means 7 and discriminates the use of the film, a releasing means 17 which abuts on a rotation lock means and releases the lock of the rotation of a supply spool 2 by the rotation lock means and a control means which actuates the releasing means 17 after the rotational state of the rotation display means 7 is read by the discrimination means are provided so as to read the rotational state of the rotation display means by the discrimination means under a state that the spool 2 is not unpreparedly rotated and to release the lock of the rotation thereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary display means for rotating integrally with a supply spool in a film cartridge and displaying whether the film is unused or used by its rotational position, and a camera. The present invention relates to a camera using a film cartridge provided with a rotation locking means for locking the rotation of the supply spool at a time other than loading.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 2-114248 discloses a film cartridge which indicates whether a film is unused or used by means of a member which moves in conjunction with rotation of a supply spool in the film cartridge. Proposed.

[0003]

However, in the above conventional example, when the film cartridge is taken out from the camera and is a single body, the supply spool is prevented from being carelessly rotated and the display being changed. In order to prevent the relative displacement between the member that moves integrally with the supply spool and the film cartridge (the outer cover of the film cartridge), a member that locks the rotation of the supply spool. Had to be provided in the film cartridge.

Therefore, in order to load the film cartridge into the camera and start the film feeding, the lock member must be released.

However, since the film is wound around the supply spool, tension is generated in the rotation direction of the supply spool, so that the supply spool rotates at the same time when the lock is released, There is a possibility that the relative position between the member that moves integrally with the supply spool and the film cartridge (the outer cover of the film cartridge) may change, resulting in incorrect information. In particular, with regard to the unused and used information of such a film, a fatal error of double exposure occurs.

In view of the above points, an object of the present invention is to provide a camera capable of preventing the double-exposure of the film by erroneously reading the usage status display of the film.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, the rotation state of the rotation display means is read, and the determination means for determining the use of the film and the rotation locking means are brought into contact with each other. And a control means for activating the releasing means after the rotation state of the rotation display means is read by the determining means.

[0008]

Operation: The supply spool is locked by the rotation locking means,
In the state where the supply spool does not rotate carelessly, the rotation state of the rotation display means is read by the determination means, and thereafter the rotation locking is released.

[0009]

1 to 5 show a first embodiment of the present invention.

FIG. 1 is a longitudinal sectional view of a film cartridge used in this embodiment, which is disclosed in US Pat. No. 4,843,343.
The following are also proposed in No. 06.

A film passing slit, a film having one end fixed to a supply spool and wound around the supply spool,
A pressing member which is arranged coaxially with the supply spool and which restricts the radial expansion of the outermost periphery of the film at the restriction portion, and prevents the outermost periphery of the film from substantially contacting the inner wall of the film cartridge, A part of the pressing member is deformed, and a releasing part that continuously releases the outermost film part of the film from the restriction in the radial direction of the pressing member, and a guiding part that guides the part of the film released from the restriction to the film passage slit. The outer circumference of the film and the holding member are prevented from slipping due to the expansion of the outermost circumference caused by the looseness of the film caused by the rotation of the supply spool in the film extrusion direction, and a driving force is applied to the film in the direction of extrusion to provide a driving force to the film. -Allowing the film to be extruded from the ridge. Hereinafter, a film cartridge capable of discharging the film by rotating the supply spool of this type will be referred to as an extruding type (thrust type) film cartridge.

FIG. 2 is a bottom view of the thrust type film cartridge, and FIG. 3 is a perspective view of a cartridge chamber of a camera in which the film cartridge is loaded.

In these figures, 1 is a thrust type film cartridge as described above, and 1a is an exterior cover of the film cartridge, which is a cutout portion 1 for exposing a part of a rotating disk 7 which will be described later.
b is formed. Reference numeral 2 is a supply spool, 3 is a film, 4 and 5 are pressing members made of an elastic material, 6 is a rotation locking lever which is rotatably mounted in the film cartridge 1 with 6e as a rotation center. Reference numeral 7 denotes a rotary disk which is fixed to the supply spool 2 and whose rotational position is controlled according to the usage state of the film 3, and information about the film is recorded by a bar code as shown in FIG. ..

Here, in order to prevent the position of the rotary disk 7 from being changed carelessly by the rotation of the supply spool 2 even when the film 3 is used or unused, the position of the rotary locking lever 6 is changed. The claw portion 6a engages with the groove 2b of the supply spool 2 and regulates the rotation of the supply spool 2. Further, whether the film 3 is used or not is detected by the position of the wide 7a of the black portion of the bar code on the rotary disk 7.

Reference numeral 8 is a film passing slit, 9 is attached to the arm 6c of the rotary locking lever 6 at one end, and is attached to the cover of the film cartridge 1 at the other end. It is a spring that gives a biasing force for rotation.
Reference numeral 10 is a cartridge lid, which is a camera body 12 which will be described later.
It is rotatably attached at parts a and 12b.

Reference numeral 11 denotes an opening / closing knob made of an elastic material for opening and closing the cartridge lid 10, and the tab 11b is operated by the user to operate the tab 11b. It has a structure that slides inside, that is, is put in and taken out. The claw portion 11b can be engaged with an engagement hole 12c of the camera body 12 which will be described later, and when the engagement hole 12c and the claw portion 11b are engaged with each other, the cartridge lid 1 is formed.
0 is locked in the closed state.

Reference numeral 12 is a camera body, which is a cartridge chamber 12.
d, an escape groove 12f and the like located at a position corresponding to the protruding portion 6b of the rotation locking lever 6. Reference numeral 13 is a fork, and there is a fork portion 13a which engages with the spline portion 2a of the supply spool 2, and as shown in FIG.
4 is urged toward the cartridge lid 10. 1
Reference numeral 5 is a fork drive gear, which is a gear portion 13a of the fork 13.
And a film feed gear train (not shown). The film supply gear train is, for example, Japanese Patent Application No. 63-2.
It is proposed in No. 20047 and the like.

Reference numeral 16 is a linear sensor for detecting a bar code on the rotary disk 7, which is composed of, for example, a CCD.
Therefore, the width of the bar code in the determination of the use state of the film can be detected even if the rotary disk 7 is not rotated. That is, whether or not the wide portion 7a of the black portion indicating the beginning of the bar code is present in the cutout portion 1b among the bar codes, that is, whether the film 3 is used or not is used, the rotating disk 7
Can be detected without rotating. Reference numeral 17 denotes a plunger for controlling the protrusion 6b of the rotation locking lever 6 to release the locking of the supply spool 2, which are arranged at the positions shown in FIG. Reference numeral 18 denotes a pin for detecting the closing of the cartridge lid 10, and a switch 49, which will be described later, is turned on and off in conjunction with this movement.

FIG. 4 is an electric block diagram of the camera according to the first embodiment of the present invention.

In FIG. 4, reference numeral 41 is a photometric circuit for measuring the brightness of an object, 42 is an encoder circuit for inputting a bar code signal from the output of the linear sensor 16, and 43 is for controlling various operations of the camera. A control circuit such as a micro computer for controlling the motor, 44 is a film feeding circuit for feeding a film 3 by controlling a motor (not shown) to rotate the fork 13 and the supply spool 2 of the camera, 45 is a plunger-17
Plunger drive circuit for controlling the rotation lock of the supply spool 2 by the protrusion 6b of the rotation lock lever 6, 46 is a shutter drive circuit for controlling the exposure of the film surface, and 47 is a camera. A switch interlocked with the release button of the pin 48 is a pin 1 for detecting the state of the cartridge lid 10.
It is a switch interlocking with 8.

Next, the operation of the portion of the control circuit 43 according to the present invention will be described with reference to the flowchart of FIG. [Step 1] To load the film cartridge 1 into the cartridge chamber 12d of the camera, the cartridge lid 1
It is determined from the state of the switch 48 whether 0 is opened. Then, by discriminating that it has been opened, the process proceeds to the next step 2. [Step 2] The plunger 17 is controlled via the plunger drive circuit 45 so that the actuator portion 17a (see FIG. 3) of the plunger 17 is retracted from the escape groove 12f. As a result, the supply spool 2 of the film cartridge 1 can be loaded in the cartridge chamber 12d in a state of being locked by the rotary locking lever 6. In other words, this is because the rotation locking lever 6 is the actuator portion 17 of the plunger 17 during the loading of the film cartridge 1 into the cartridge chamber 12d.
This is an operation for preventing the supply spool 2 from being unlocked by coming into contact with a. [Step 3] Switch 4 for checking whether the film cartridge 1 is loaded and the cartridge lid 10 is closed.
Determine from the state of 8. Then, when it is determined that it is closed, the process proceeds to the next step 4. "Step 4" The bar code signal detected by the linear sensor 16 is read through the encoder circuit 42. That is, here, the bar code signal is read in order to detect whether or not the wide portion 7a of the black portion indicating the beginning of the bar code is present in the cutout portion 1b. "Step 5" Based on the bar code signal read in step 4, it is checked whether or not the wide portion 7a of the black portion indicating the beginning of the bar code is present in the cutout portion 1b, and the usage state of the film is determined. As a result, if the film 3 is unused, the process proceeds to step 5, and if used, the process proceeds to step 9. "Step 6" The plunger 17 is controlled via the plunger drive circuit 45, the actuator 17a is made to enter the escape groove 12f, and the rotation locking lever 6 in the film cartridge 1 is shown in FIG. Rotate counterclockwise to disengage the claw portion 6a of the rotation locking lever 6 from the groove 2b of the supply spool 2. That is, the rotation lock of the supply spool 2 is released. "Step 7" The film feeding circuit 44 is driven to start feeding the film 3.

Here, the film cover used in the present invention.
Initially, the cartridge 1 contains all the film (is wound up), and when the film cartridge 1 is loaded into the camera, the film 3 is loaded from the inside of the film cartridge 1 into the film winding spool of the camera. -The operation of the above step 7 for extruding into the roll (not shown) is started, but at this time, the fork 13 and the spline portion 2 of the supply spool 2 are started.
Although it may not be engaged with a, it naturally comes into engagement as the fork 13 rotates. "Step 8" The bar code signal detected by the linear sensor 16 is read through the encoder circuit 42. That is, in this case, the bar code signal is read from the rotating rotating disk 7 in order to detect information about the film (information such as the number of specified frames, film sensitivity, etc.).

After that, a series of photographing operations is started.

Also, in step 5 above, the film 3
If has been used, then step 9
Go to. "Step 9" Here, the film card that has been used by mistake
A warning that the cartridge 1 has been loaded is given using a means (not shown) to notify the photographer. Then, the operation of the camera ends.

FIG. 6 shows another example of the structure of the film cartridge used in the present invention. The difference from the film cartridge shown in FIG. 1 is that the exterior cover-1a has a cutout portion 1b. In addition, two notches 1c and 1d are provided. On the camera side, for example, if the wide width 7a of the bar code is located at the notch 1b, it is "unused", the notch 1c.
If it is at the position of "," it is judged as "used", and if it is at the position of the notch 1d, it is judged as "used halfway". At this time, the linear sensor 16 as shown in FIG. 3 is provided on the camera side at a position facing the notches 1c and 1d. FIG. 7 shows a camera according to the second embodiment of the present invention. 18 is a photoreflector, and a photoreflector 18 has a focus on the bar code at the position indicated by the solid line in FIG. 7 and can be detected with high resolution, so that a thin bar code can also be detected. . Reference numeral 18 'is a photoreflecting position for detecting a thick bar code (wide 7a). The bar code is in a defocused state, and the thin bar code is averaged in light and dark. Although the output is at an intermediate level, the thick bar code does not affect the amount of defocus, so that the output can be reliably obtained and detected.

According to each of the above embodiments, the bar is set after the film is loaded and before the rotation lock of the supply spool 2 is released.
The code is read to determine the use state of the film, and after that, the rotation lock of the supply spool 2 is released, so that the relative position between the supply spool and the film cartridge is accurately detected. It is possible to prevent double exposure by using a used film as an unused film.

[0027]

As described above, according to the present invention,
The discriminating means for reading the rotational state of the rotational display means and discriminating the use of the film, and the releasing means for contacting the rotational locking means and releasing the rotational locking of the supply spool by the rotational locking means, the discrimination And a control means for activating the releasing means after the rotation state of the rotation display means is read by the means, the supply spool is locked by the rotation locking means, and the supply spool is rotated carelessly. In a state where the rotation display means is not operated, the rotation state of the rotation display means is read by the determination means, and thereafter the rotation locking is released. Therefore, it is possible to prevent the film usage state display from being erroneously read and the film being double-exposed.

[Brief description of drawings]

FIG. 1 is a vertical plan view of a thrust type film cartridge used in this embodiment.

2 is a bottom view of the film cartridge of FIG. 1. FIG.

3 is a perspective view of a cartridge chamber of the camera according to the first embodiment of the present invention, in which the film cartridge of FIG. 1 is loaded.

FIG. 4 is an electrical block diagram of the camera of the first embodiment of the present invention.

5 is a flowchart showing the operation of a part of the main part of the control circuit of FIG.

FIG. 6 is a longitudinal sectional view of another example of a thrust type film cartridge used in this embodiment.

FIG. 7 is a diagram showing a cross section of a film cartridge showing a state of reading a bar code and a configuration of a main part of a camera in a second embodiment of the present invention.

[Explanation of sign]

 1 film cartridge 2 supply spool 6 rotation locking lever 6b protrusion 7 rotation disk 10 cartridge lid 16 linear sensor 17 plunger 43 control circuit 45 plunger drive circuit

Claims (1)

Claim: What is claimed is: 1. A rotation display means for rotating integrally with a supply spool in a film cartridge, for indicating whether the film is unused or used by its rotation position, and a camera. A camera using a film cartridge equipped with a rotation locking means for locking the rotation of the supply spool at a time other than loading, wherein the rotation state of the rotation display means is read to determine the use of the film. A discriminating means, a releasing means for abutting against the rotation locking means and releasing the rotation locking of the supply spool by the rotation locking means, and after reading the rotational state of the rotation display means by the judging means, A camera provided with control means for operating the releasing means.