JPH09211673A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable proper magnetic recording. SOLUTION: When recording of designated magnetic data is ended (#290), the rotating speed of a motor is decreased (#300) to lower the film feed speed. That is, from the point of time when recording of designated magnetic data is ended, a motor is braked, and the rotating speed is lowered to keep the rotating speed. When the trailing end of the perforation is detected (#310), the rotation of the motor is stopped, and feeding of the film is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera for loading a film cartridge according to a novel system and taking a picture.

[0002]

2. Description of the Related Art In a conventional camera, a film winding operation is carried out by fitting a convex portion provided on the outer periphery of a winding spool into a perforation formed in the film.

[0003]

In recent years, a pair of perforations have been regularly formed in the film winding direction as a film according to a novel system, and
It is proposed that an exposure area for photographing and a magnetic recording area for recording predetermined magnetic data are provided at preset positions. The perforation is not used for the winding operation as in the prior art, but is used as a reference for positioning the exposure area and the magnetic recording area. Therefore, in a camera using such a film, it is not possible to take an image within the set exposure area unless the winding is accurately stopped from the detection of the perforation. On the other hand, magnetic recording may be performed during film winding, but in this case, proper magnetic recording cannot be performed, for example, if the winding speed changes, the bit density of the recorded data also changes.

The present invention solves the above problems, and an object of the present invention is to provide a camera capable of performing proper magnetic recording.

Another object of the present invention is to provide a camera capable of reliably photographing within a set exposure area.

[0006]

According to the present invention, a perforation for stopping position reference is regularly formed in a row at one side edge in the film width direction, and a photographing area provided between the perforations. A camera for taking pictures by sequentially winding the film on each frame by a drive source on each frame of a film having a frame and a magnetic recording area for recording predetermined data provided corresponding to each frame. There
Magnetic recording means for recording the data, recording control means for outputting the data to the magnetic recording means to record the data in the magnetic recording area during winding of the film, and the drive source of the drive source during the recording of the data. A drive control means for maintaining the drive speed at the first speed, a perforation detection means arranged at a predetermined position, and a stop control means for stopping the drive source when the rear end of the perforation is detected are provided. (Claim 1).

According to this structure, recording is performed in the magnetic recording area by the magnetic recording means during film winding.
During this recording, the driving speed of the driving source is maintained at the first speed, whereby magnetic recording is performed without changing the film feeding speed. When the rear end of the perforation is detected, the drive source is stopped.

Further, the perforation detecting means is arranged rearward in a film winding direction with respect to a position facing the perforation when the film is at a photographing position (claim 2).

According to this structure, the perforation detecting means is arranged rearward in the film winding direction with respect to the position facing the perforation when the film is in the photographing position, so that the rear end of the perforation is detected. When the drive source is stopped by this, the next frame is placed at the shooting position.

Further, in the camera according to the present invention, the deceleration control means for decelerating the rotational speed of the drive source to a second speed lower than the first speed after the recording of the data by the recording control means is completed. Is provided (Claim 3).

According to this structure, after the recording of the data by the recording control means, the rotation speed of the driving source is reduced to the second speed lower than the first speed, so that the driving source stops in a short time. It will be.

The deceleration start time point by the deceleration control means is a data recording end time point by the recording control means (claim 4).

According to this structure, when the recording control means finishes recording the data, the rotational speed of the drive source is reduced to the second speed, which is lower than the first speed, so that the drive source stops in a short time. Will be done.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a camera according to the present invention will be described below with reference to the drawings. 1 and 2 are schematic configuration diagrams of the inside of the camera body. FIG. 1 is a view seen from the top side, and FIG. 2 is a view seen from the back side. FIG. 3 is a block diagram showing a film feeding system.

As shown in FIG. 1, the camera body 11 has a photographic lens section 12 having a photographic lens (not shown) arranged in the center thereof, and a cartridge loading chamber arranged on the right side of the photographic lens section 12. 13 and this cartridge loading chamber 13
A film feeding motor 14 arranged on the right side of the film taking-up chamber, a film winding chamber 15 arranged on the left side of the photographing lens unit 12, and an exposure arranged behind the optical axis of the photographing lens unit 12. A battery housing chamber 1 for housing the frame 16 and the perforation sensor 17 and the battery 18 arranged at the right end portion.
9 and 9.

The cartridge loading chamber 13 is for loading the film cartridge 21. The film cartridge 21 accommodates the film 22 therein. As shown in FIG. 3, the film cartridge 21 has a cylindrical shape, and a film pull-out portion 23 is projectingly provided on a side surface parallel to the axis.
A film outlet (not shown) is provided on the front end surface of the film 3, and the film 22 is pulled out from the film outlet.

The film winding chamber 15 is provided with a winding spool 24 for winding a film, and a cylindrical film retainer 25 which is arranged in contact with the peripheral surface of the winding spool 24 at a required pressure. There is. As shown in FIG. 3, the winding spool 24 has a cylindrical shape and is rotatably arranged in the film winding chamber 15.

As shown in FIG. 2, the exposure frame 16 is a horizontally long frame body, and is provided with an exposure window 26 provided on the optical axis of the taking lens unit 12 (FIG. 1). The exposure window 26 has a rectangular shape with a predetermined aspect ratio, and controls the exposure area of the film.

The perforation sensor 17 is composed of a photo interrupter, and detects the perforations 41 and 42 (FIG. 4) punched in the film to control the feeding of the film. The arrangement position of the perforation sensor 17 will be described later.

As shown in FIG. 3, the motor 14 is connected to the film cartridge 21 and the winding spool 24 by a cartridge speed reducing system 31 and a winding spool speed reducing system 32. The cartridge speed reduction system 31 and the winding spool speed reduction system 32 are composed of gears and the like, and
The rotation driving force of No. 4 is transmitted to the film cartridge 21 and the winding spool 24 at a predetermined reduction ratio.

As shown in FIG. 3, a motor rotation amount sensor 33 is attached to the motor shaft 14a of the motor 14. The motor rotation amount sensor 33 is configured by a pulse encoder including a disc 34 having detection pieces protruding from the peripheral edge at regular intervals and a photo interrupter 35 that detects passage of the detection pieces, and detects the rotation amount of the motor 14. To do.

The motor rotation amount sensor 33 may be a pulse encoder including a disk having slits formed at regular intervals in the circumferential direction and a photo interrupter for detecting passage of the slits.

As shown in FIG. 2, the camera body 11 also includes a magnetic head 36 disposed below the exposure window 26 at the lower left. The magnetic head 36 is arranged so as to face the film 22 and records magnetic data as described later. The magnetic head 36 also reads the recorded magnetic data. When only some frames of the film 22 stored in the film cartridge 21 have been exposed, the magnetic head 36 causes the frame magnetic recording portion 45 to be exposed.
By detecting whether or not magnetic data is recorded in (FIG. 4), the unexposed frame position can be detected. The arrangement position of the magnetic head 36 will be described later.

The camera body 11 includes a magnetic head 36.
Of the magnetic head 3 between the recording / reproducing position where the head surface of the recording medium is in contact with or close to the surface of the film 22 and the retracted position where the recording / reproducing position is separated.
The magnetic head 36 comes in contact with the surface of the film 22 only when recording and reading magnetic data.

FIG. 4 is a view showing the structure of the film 22. The film 22 is composed of three regions including a leader portion 22a, an exposure portion 22b, and an end portion (not shown) from the top (the left end in FIG. 4). The leader portion 22a is a lead portion for pulling out the film 22 from the film cartridge 21, the exposure portion 22b is an area where a predetermined number of photographs are photographed at a predetermined pitch, and the end portion is a photograph for the last frame of the exposure portion 22b. This is an area for pulling out the film 22 from the film cartridge 21 by a predetermined size or more in order to enable the above.

One side edge in the width direction of the film 22 (in FIG. 4,
On the upper side), rectangular perforations 41 and 42 of the same shape are regularly formed in pairs along the side edges, and a piece 43 for photographing is provided between the perforations 41 and 42. There is.

This perforation 41 is used as a reference for the stop position when the film 22 is wound up, and the perforation 42 is used as a reference for the position of the frame 43 and the magnetic recording portions 44 and 45 described later by the method described later.

The dimension of the perforations 41 and 42 in the winding direction is set to d0, and the interval between adjacent perforations 41 is set to the dimension d1.
And the distance between the perforation 42 and the dimension d2 (however,
It is set to d2 <d1-d2).

Further, a reader magnetic recording section 44 and a plurality of frame magnetic recording sections 45 are provided on the other side edge portion (lower side in FIG. 4) of the film 22 in the width direction.

The reader magnetic recording unit 44 is the reader unit 2.
It is an area provided in 2a for recording a title corresponding to the entire film and top-bottom information for perforation of the photographed picture.

The frame magnetic recording unit 45 includes the exposure unit 2
It is provided adjacent to each film 43 of 2b in the film width direction,
It is for recording predetermined information such as a shooting date, a shooting screen (vertical / horizontal), an exposure control value, a shooting magnification, an angle of view, a light source, and the number of prints regarding a picture taken on each frame 43.

The areas of the reader magnetic recording section 44 and the frame magnetic recording section 45 are set by the dimension from the right end of the perforation 42. That is, the front end of the reader magnetic recording unit 44 has a dimension d3 from the right end of the leading perforation 42, and the rear end has a dimension d4. In addition, the front end of the frame magnetic recording unit 45 is connected to each of the perforations 4
2 has a dimension d5 from the right end and a dimension d6 from the rear end.

Next, the positions of the perforation sensor 17 and the magnetic head 36 will be described with reference to FIGS. FIG. 5 is a view showing a state in which the film 22 is wound around the winding spool 24 in FIG. 2 and is in a photographing position.

As shown in FIG. 5, the perforation sensor 17 is at a height position where passage of the perforations 41 and 42 can be detected, and as shown in FIG.
The detection point is arranged at the position of the dimension d7 in the front in the film winding direction with respect to the center line of the exposure window 26.

Then, as shown in FIG. 5, the detection point of the perforation sensor 17 is located in the middle of the perforations 41 and 42 when the frame of the film 22 is in the photographing position. By detecting the edge of the perforation 41 by the perforation sensor 17, as will be described later, the film 2 at the time of shooting
The feeding stop control in the one-frame feeding of No. 2 is performed.

Further, as shown in FIG. 2, the magnetic head 36 is located at the position of the dimension d8 in the front in the film winding direction with respect to the center line of the exposure window 26, and the magnetic recording section 44,
It is arranged at a height position through which 45 passes. In the present embodiment, d7 = d8, and the position in the film feeding direction matches the perforation sensor 17.

FIG. 6 is a block diagram showing the control system of this camera. The motor driver 51 supplies a drive current to the motor 14, and when stopping the rotation of the motor 14, it can be stopped in a short time by applying reverse energization braking. The motor driver 51 also enables a motor stop control that combines short-circuit braking (short brake) performed by short-circuiting both ends of the motor 14 and natural braking (open brake) performed by disconnecting both ends of the motor 14 depending on conditions. It is a thing.

The magnetic head driver 52 is used for the magnetic head 3
By supplying an electric current to the magnetic recording medium 6 on and off,
4 and 45 record data, and the supply current is controlled by the controller 60. Further, when the magnetic data is read by the magnetic head 36, the magnetic data is magnetically picked up and sent to the control unit 60.

The photometric distance measuring unit 53 measures the subject brightness and the subject distance, and the exposure unit 54 exposes the film using the measurement result of the photometric distance measuring unit 53.

The control unit 60 comprises a ROM 61, a RAM 62, a microcomputer having a clock function, and the like,
As shown in the flow charts of FIGS. 8 and 9 described later, the operation of the camera is controlled. The RAM 62 temporarily stores various data.

The ROM 61 also stores a control program and table data for obtaining the film feed amount when the motor rotation amount sensor 33 rotates by one pulse from the current number of frames of the film 22. Is. That is, the diameter of the winding spool 24 and the thickness of the film 22 are known, and these can be used to calculate the ratio of the winding thickness of the winding spool 24 according to the number of frames of the film 22. Further, the speed reduction ratio of the winding spool speed reduction system 32 is also known. From this speed reduction ratio and the ratio of the above-mentioned winding thickness, the film feed amount per pulse from the motor rotation amount sensor 33 is a function of the number of frames of the film 22. Is calculated in advance. The ROM 61 stores this function as table data.

A release switch 63 is connected to the control unit 60. This release switch 63
Is disposed at a proper place on the surface of the camera body 81 for performing a photographing operation, and the control section 60 controls the operation of each section when the release switch 63 is pressed.

Next, the operation of the camera will be described with reference to the timing chart of FIG. 7 and the flowcharts of FIGS. 7 is a timing chart showing the state of each part, FIG. 8 is a flowchart showing the procedure of the main routine, and FIG. 9 is a flowchart showing the procedure of the subroutine # 160 of FIG.

First, it is determined whether the release switch 63 is on or off (# 110). If it is off (N in # 110,
O), wait. At this time, the film 22 is arranged as shown in FIG.

On the other hand, if the release switch 63 is on (YES in # 110), photometry and distance measurement are performed (# 12).
0), and then the film 22 is exposed (# 13
0) When the exposure is completed, acceptance of the release switch 63 is prohibited (# 140), and the winding operation is started (# 150).

That is, as shown in FIG.
The motor current I _M is supplied to the motor. Then, the rotation speed V _M of the motor 14 increases toward a stable speed, and the pulse width of the detection signal SMP of the motor rotation amount sensor 33 is shortened accordingly, and the motor 14 is kept at a constant rotation speed V _1.
Is driven.

Next, the process proceeds to the data recording subroutine shown in FIG. 9 (# 160). First, by referring to the table data stored in the ROM 61, the film feed amount per pulse of the detection signal SMP of the motor rotation amount sensor 33 is obtained using the current number of frames of the film 22, and this and the dimension d5 ( Figure 4
(See) and the detection signal SM for feeding only the dimension d5
The number N of P pulses is calculated (# 200).

Next, when the front end of the perforation 42 is detected by the perforation sensor 17, (#
210: YES), the detection signal of the motor rotation amount sensor 33
When the SMP pulse number count is started (# 220) and the rear end of the perforation 42 is detected by the perforation sensor 17 (YES in # 230),
The pulse number count of the detection signal SMP of the motor rotation amount sensor 33 is once reset (# 240), and the average feeding speed of the film 22 is calculated from the count pulse number M immediately before this reset (# 250). That is, from the dimension d0 of the perforation 42 and the pulse number M of the detection signal SMP of the motor rotation amount sensor 33 output during that period,
The film feed rate is calculated.

Next, the recording frequency of the magnetic data is calculated using the calculated film feeding speed (# 26).
0). This is because the film feeding speed varies depending on other factors such as the degree of battery consumption and the amount of data to be recorded (the number of bits) is preset, so that the magnetic recording area 45 of the film 22, that is, FIG. Dimensions (d
This is for recording the magnetic data in 6-d5) at an appropriate bit density.

Subsequently, from the detection of the rear end of # 230, the dimension d5 is obtained.
(See FIG. 4) It is determined whether the film has been fed (# 270). That is, it is determined whether or not the number of pulses of the detection signal SMP counted from the detection of the trailing edge of # 230 has reached the calculated number of pulses N.

When the film is fed by the dimension d5 (YES in # 270), the magnetic data is recorded (# 280) until the predetermined magnetic data is recorded (#
(NO in 290) and recording of magnetic data is completed (YES in # 290), the rotation speed of the motor 14 is decelerated and the film feeding speed is reduced (# 300).

That is, as shown in FIG. 7, recording of magnetic data is started at time t ₁ and recording of predetermined magnetic data is completed at time t ₂ . By performing an inverse energization of the motor current I _M is supplied from the t ₂ point to the motor 14 as -I _2, braked motor 14, to reduce its rotational speed to the rotational speed V ₂ (<V _1). Then, after the rotation speed is reduced to V ₂ , the current supply to the motor 14 is turned on and off at a predetermined duty ratio to maintain a substantially constant rotation speed V ₂ . This rotation speed V ₂ is the detection signal SMP from the motor rotation amount sensor 33 per unit time.
It is obtained by controlling the number of pulses of (1) to a predetermined value.

Then, the process continues until the rear end of the perforation 41 is detected (NO in # 310), and when the rear end is detected (YES in # 310), the process returns to the main routine of FIG.

Then, as shown in FIG. 7, the motor current I _M supplied to the motor 14 is set to -I ₂ and reverse rotation is performed to stop the rotation of the motor 14 and the feeding of the film 22 is stopped (# 170), the arrangement of the film 22 is
The state shown in FIG. 5 is obtained after feeding one frame. Then, acceptance of the release switch 63 is permitted (# 180), and # 11
After returning to 0, the release switch 63 is in a standby state.

As described above, as shown in FIG. 5, the perforation sensor 17 is arranged so as to be located between the perforations 41 and 42 when the film 22 is in the photographing position. Since the recording of the magnetic data is started when the number of pulses of the motor rotation amount sensor 33 is counted by a predetermined number, the recording of the magnetic data should be surely started within the preset area of the magnetic recording unit 45. You can

Further, the feeding speed of the film 22 is calculated by counting the number of pulses of the motor rotation amount sensor 33 during the passage of the perforation 42, and the recording frequency of the magnetic data is determined according to the feeding speed. Therefore, the magnetic recording unit 4 which is surely set in advance is set.
5 can be recorded in the area, and magnetic data can be recorded at an appropriate bit density.

During recording of magnetic data, the motor 14
Since the film 22 is fed without turning on and off, the film 22 can be fed at a constant speed while suppressing variations in the feeding speed due to fluctuations in current consumption. It is possible to prevent variations in data bit density and bit width. Therefore, it is possible to accurately read the magnetic data.

Further, since the feeding speed of the film 22 is lowered after the recording of the magnetic data is completed, the film 22 can be stopped in a short time after the detection of the trailing edge of the perforation 41. Feeding can be stopped accurately.

The rotation speed V ₂ is such that the film 22 stops in a short time from the start of deceleration at # 170, and the frame 43 of the film 22 is accurately arranged with respect to the exposure window 26 as shown in FIG. It is set to a value that can be.

In the above embodiment, the position in the film feeding direction is the same in the magnetic head 36 and the perforation sensor 17 when d7 = d8. However, when d7 ≠ d8, the perforation is performed in # 200. Correcting the relative distance between the sensor 17 and the magnetic head 36
The number of pulses corresponding to (d5 + d8-d7) may be calculated.

The present invention is not limited to the above-mentioned embodiment, and the following modifications can be adopted.

(1) The pulse number N from the detection of the rear end of the perforation 42 calculated in # 200 of FIG. 9 to the start of magnetic data recording is N = M × after the pulse number M is obtained in # 240. It may be calculated by d5 / d0. This has the same effect.

(2) As for the pulse number N, a predetermined value of about 10 pulses may be added to the calculated value in consideration of the position detection error. This makes it possible to more reliably record the magnetic data in the magnetic recording area 45.

(3) The film feeding speed may be calculated by counting the pulse width time of the detection signal SMP of the motor rotation amount sensor 33 immediately before time t _{1 in} FIG. Thereby, the film feeding speed immediately before recording the magnetic data can be calculated, and by using the calculation result, the recording frequency of the magnetic data can be appropriately determined.

(4) In the above embodiment, # 300 in FIG.
The deceleration of is started from the end of recording magnetic data.
Instead of this, the deceleration may be started at the time point when the front end of the perforation 41 for detecting the rear end is detected in # 310.

(5) In step # 300 of FIG.
The duty ratio of the current supply to the motor 14 after the rotation speed of the motor is reduced to the rotation speed V ₂ with at least one of the ON / OFF characteristics of the motor 14, the ambient temperature, or the power supply voltage as a parameter, You may decide. As a result, the rotation speed V ₂ can be maintained at a suitable value according to the variation of each parameter.

[0067]

As described above, according to the present invention,
Since the driving speed of the driving source is maintained at the first speed during the magnetic recording by the magnetic recording means, it is possible to prevent the fluctuation of the film feeding speed, which allows the magnetic recording with a constant bit density. It can be suitably performed.

Further, when the perforation detecting means is disposed rearward in the film winding direction with respect to the position facing the perforation when the film is at the photographing position, when the trailing end of the perforation is detected and the drive source is stopped. The next piece can be reliably placed at the shooting position.

Further, when the rotation speed of the drive source is reduced to the second speed lower than the first speed after the recording control means has finished recording the data, the drive source is not adversely affected to the magnetic recording. Can be stopped in a short time, and thus the film can be stopped accurately.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram seen from the upper surface side inside a camera body.

FIG. 2 is a schematic configuration diagram viewed from the back side inside the camera body.

FIG. 3 is a configuration diagram showing a film feeding system.

FIG. 4 is a diagram showing a structure of a film.

FIG. 5 is a diagram showing a state in which the film is wound around a winding spool in FIG. 2 and is in a photographing position.

FIG. 6 is a block diagram showing a control system of the camera.

FIG. 7 is a timing chart showing a state of each part.

FIG. 8 is a flowchart showing a procedure of a main routine.

9 is a flowchart showing a procedure of a subroutine # 160 of FIG.

[Explanation of symbols]

11 camera body 14 motor (driving source) 17 perforation sensor (perforation detection means) 21 film cartridge 22 film 24 winding spool 33 motor rotation amount sensor 36 magnetic head (magnetic recording means) 41, 42 perforation 43 frame 44 reader magnetic recording unit 45 Frame magnetic recording unit (magnetic recording area) 51 motor driver 52 magnetic head driver 60 control unit (recording control unit, drive control unit, stop control unit, deceleration control unit) 61 ROM 62 RAM

Claims (4)

[Claims] 1. A perforation for stopping position reference, which is regularly drilled in a line at one side edge in the film width direction, a frame formed between the perforations and a frame formed between the perforations, and each frame described above. It is a camera for sequentially filming film by winding each film by a driving source into each frame of a film provided with a corresponding magnetic recording area for recording predetermined data, and recording the above data. Magnetic recording means, recording control means for outputting data to the magnetic recording means during recording of the film to perform recording in the magnetic recording area, and driving speed of the drive source during recording of the first data. Drive control means for maintaining a constant speed, perforation detection means arranged at a predetermined position, and stop control for stopping the drive source when the rear end of the perforation is detected. A camera having means. 2. The perforation detecting means is arranged rearward in a film winding direction with respect to a position facing the perforation when the film is in a photographing position. The listed camera. 3. The camera according to claim 1, wherein
A camera comprising deceleration control means for decelerating the rotation speed of the drive source to a second speed lower than the first speed after the recording control means has finished recording data. 4. The camera according to claim 3, wherein the deceleration start time point by the deceleration control means is a data recording end time point by the recording control means.