JPH099003A - Image fetching device - Google Patents

Abstract

PURPOSE: To obtain an image which is easy to see without outputting an unnecessary image by deciding the start position of subscanning fetching by the subscanning means of an image pickup means based on the offset amount of a stop position. CONSTITUTION: The image of an irradiated exposure area 11 is image-formed on a line sensor 17 through an image pickup optical system 16. Photoelectric conversion is sequentially performed on the line sensor 17 by moving the line sensor 17 in the feeding direction of a film by a subscanning motor 21. At the time of winding-up the film 1 or at the time of rewinding it, offset occasionally occurs. Thus, a photoreflector and the like detect the perforations 1a and 1b of the film 1 for correcting the offset quantity of the film 1. The offset quantity of the corresponding film 1 is calculated from the shift speed of the film 1, which is thus detected, and the line sensor 17 is moved in the direction of subscanning based on the offset quantity so as to correct offset quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image capturing device, and more particularly to an image capturing device for converting an image recorded on a silver salt film into a video signal.

[0002]

2. Description of the Related Art Conventionally, in an image capturing device that captures an image exposed on a film by illuminating light, when the image capturing region of the reading device does not match the exposure region of the film when the image is read. A portion other than the exposed area of the film is imaged, and this portion is displayed on a monitor or the like as, for example, a monochrome frame, which is often unsightly for the user.

Therefore, as a proposal for solving such a problem, for example, Japanese Patent Publication No. 6-28371 discloses an image read by an image reading means by sandwiching a negative film between predetermined film carriers having slits. There is described an image reading apparatus which detects the position of the slit and determines the reading range of the image by the image reading means by using this position as a reference.

Further, the means for detecting the perforation of the film by using a detecting means such as a photosensor and positioning the film with reference to the perforation has been generally used in cameras conventionally. is there.

[0005]

However, according to the one disclosed in Japanese Patent Publication No. 6-28371, the film carrier is used when the film stored in the film cartridge in a long roll is used as a document. There was no use and wasted.

Further, the means for positioning the film on the basis of perforation, which is generally used in the above-mentioned camera, completely eliminates the deviation of the stop position when feeding the film, that is, the so-called offset. It was not possible to output unnecessary images.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an image capturing apparatus which can output an unnecessary image and can make the image easy to see.

[0008]

In order to achieve the above object, an image capturing apparatus of the present invention according to claim 1 comprises a light source means for illuminating a developed silver salt film, a line sensor and this line sensor. Image pickup means having moving sub-scanning means for converting an image recorded on a silver salt film illuminated by the light source means into a video signal, feeding means for feeding the silver salt film, and feeding means Means for obtaining an offset amount from the intended stop position of the silver salt film fed and stopped by the means, and the sub-scanning of the imaging means based on the offset amount obtained by this means And a positioning means for determining the start position of the sub-scanning image capturing by the means.

According to a second aspect of the present invention, in the image capturing device of the present invention, the image capturing device has a moving amount detecting means for detecting the moving amount of the silver salt film by the feeding means, and the offset amount. The means for obtaining is to detect the movement amount from the target stop position to the actual stop position by the movement amount detection means.

Further, in the image capturing device of the present invention according to claim 3, the image capturing device includes a feeding speed detecting means for detecting an amount related to the feeding speed of the silver salt film by the feeding means. A means for obtaining the offset amount calculates the offset amount from the target stop position to the actual stop position based on the feeding speed of the silver salt film detected by the feeding speed detecting means. According to claim 1,

[0011]

In the image capturing apparatus of the present invention according to claim 1, the light source means illuminates the developed silver salt film, and the image pickup means having the line sensor and the sub-scanning means for moving the line sensor is illuminated by the light source means. The image recorded on the formed silver salt film is converted into a video signal, the feeding means feeds the silver salt film, and the means for determining the offset amount is fed by the feeding means and stopped by the silver. The offset amount from the target stop position of the salt film to the actually stopped position is obtained, and the positioning unit determines the sub-scanning image by the sub-scanning unit of the image pickup unit based on the offset amount obtained by the offset amount obtaining unit. Determine the start position of acquisition.

In the image capturing device of the present invention according to claim 2, the moving amount detecting means detects the moving amount of the silver salt film by the feeding means, and the means for obtaining the offset amount stops the target. The movement amount from the position to the actual stop position is detected by the movement amount detecting means.

Further, in the image capturing apparatus of the present invention according to claim 3, the feeding speed detecting means detects the amount relating to the feeding speed of the silver salt film by the feeding means, and obtains the offset amount. The means calculates the offset amount from the target stop position to the actual stop position based on the feeding speed of the silver salt film detected by the feeding speed detecting means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 13 show a first embodiment of the present invention, FIG. 1 is a perspective view showing an image capturing device, FIG. 2 is a plan view (A) showing the image capturing device, and FIG. It is a front view.

When the film cartridge 2 is loaded in the image taking-in device, the film 1 as the silver salt film delivered from the film cartridge 2 is taken up by the take-up spool 3.

The film 1 has a perforation 1a formed in the upper left of each exposure area 11 and a perforation 1b formed in the upper right.

The hoisting spool 3 is wound through a gear train 4 and a gear train 5 by a hoisting motor 6 serving as a feeding means to wind a film in the film winding direction (one frame feed direction).
It is designed to be rotated.

Further, the film cartridge 2 is rotated in the film rewinding direction (one frame rewinding direction) as shown by an arrow B by a rewinding motor 9 as a feeding means via a gear train 7 and a gear train 8. It is supposed to be done.

The feeding position of the film 1 is detected by detecting the perforations 1a and 1b by a photoreflector 22 which is a means for obtaining an offset amount and is a movement amount detecting means, and further, it is applied to the film 1. The driven roller 12 that rotates in contact with the driven roller 12, the light shielding plate 13 that is provided integrally with the driven roller 12 and that projects a plurality of comb teeth from the peripheral edge, and the offset amount that detects the rotational position of the light shielding plate 13. A more detailed position can be detected by the photo interrupter 14, which is a means for obtaining the distance and a movement amount detecting means.

A light source 15 as a light source means is arranged at a position substantially perpendicular to the center of the exposure area 11 of the film 1 drawn out to a predetermined position. The light source 15 is arranged on the opposite side of the light source 15 with the film 1 interposed therebetween. The image pickup optical system 16 is provided.

Further, the optical axis O- of the image pickup optical system 16 is
At the image forming position on O ′, the line sensor 17 which is an image pickup system is provided.
The line sensor 17 is held by a carriage 18.

The carriage 18 is connected via a lead screw 19 to a sub-scanning motor 21 which is a sub-scanning means composed of, for example, a stepping motor so that the line sensor 17 can be moved in the film feeding direction. Image pickup means.

Next, the operation of the image capturing device thus constructed will be described.

First, in the case of winding the film 1 and feeding one frame, when the winding motor 6 is rotated, the rotation is transmitted to the winding spool 3 through the gear train 4 and the gear train 5, and the winding is performed. The film 1 is wound up by rotating the spool 3.

When the film 1 is rewound, when the rewinding motor 9 is rotated, the rotation is transmitted to the shaft of the film cartridge 2 through the gear train 8 and the gear train 7, and the shaft is rotated. Film 1 to rewind.

When the image of the exposed area 11 of the film 1 is read, when the light source 15 is made to emit light, the light is emitted in the direction of the optical axis OO ′, and the image of the exposed area 11 is illuminated.

The image of the exposed exposure area 11 is
An image is formed on the line sensor 17 via the imaging optical system 16.

By moving the line sensor 17 in the film feeding direction which is the sub-scanning direction by the sub-scanning motor 21, photoelectric conversion is sequentially performed on the line sensor 17 to read the image in the exposure area 11. To be

When the film 1 is wound up or rewound, a deviation (offset) may occur without stopping the film 1 at a predetermined position. The offset amount of the film 1 means the amount of deviation from the initial (reset) position of the line sensor 17 with respect to the end of the film image frame in the exposure area 11.

This offset amount is determined by the running film 1.
, It depends on the distance to the stop when the brake is applied, and is therefore related to the transport speed of the film 1.

Therefore, in order to correct the offset amount of the film 1, the transport speed of the film 1 is detected by detecting the perforations 1a and 1b of the film 1 by the photoreflector 22, and further, the film 1 is rotated in accordance with the transport operation. The comb teeth of the light shielding plate 13 of the driven roller 12 are detected by the photo interrupter 14 and calculated from the number of rotation pulses.

The transfer speed V of the film 1 thus detected
On the other hand, the offset amount Δx of the film 1 has the relationship shown in the diagram of FIG. 3 from the experiment.

For example, when the speed is V1, the offset amount Δx1 of the film 1 is Δx1 = aV1 + b. Here, a and b are constants.

Thus, the offset amount Δx1 of the film 1 corresponding to the transport speed V1 of the film 1 detected is calculated, and the line sensor 17 is moved in the sub-scanning direction based on the offset amount Δx1. And correct it.

Next, more details will be described with reference to FIGS. 4 to 13.

FIG. 4 is a block diagram mainly showing the electrical construction of the image capturing apparatus of this embodiment.

This image capturing apparatus obtains the outputs of the film feeding motor drive circuit section 25 for driving and controlling the winding motor 6 and the rewinding motor 9 and the outputs of the photo interrupter 14 and the photo reflector 22 to obtain the film 1. A film position detection circuit section 26 for position detection, an input key operation circuit section 27 for performing various input operations such as mode input and image capture input, and a sub scanning motor for driving and controlling the sub scanning motor 21. A drive circuit unit 28 and an image pickup drive circuit 29 for driving and controlling the line sensor 17
And a system control circuit 24, which is a positioning means for integrally controlling the above circuits and a feeding speed detecting means.

FIG. 5 is a front view showing the image capturing device when (A) the film is stopped at a predetermined position and (B) when an offset occurs.

As shown in FIG. 5, the line sensor 17 is
When the exposure area 11 faces the rectangular frame member 31,
The image is read.

When the film 1 is accurately stopped and there is no offset, the line sensor 17 is set to the reset position 32 as shown in FIG. 5A in the initial state. At this time, the upper right perforation 1b of the exposure area 11 is accurately positioned on the photo reflector 22. If there is no offset in this way, the image of the exposure area 11 may be read from the position where the line sensor 17 is moved from the reset position 32 by Δx0.

On the other hand, as shown in FIG. 5B, when the film 1 is fed in the winding (one-frame feed) direction, the arrow A
When the offset amount Δx is generated due to excessive feeding in the winding direction shown in (1), the offset amount Δx is directly read from the pulse of the photo interrupter 14 due to the rotation of the light shielding plate 13, and the normal movement amount Δx0 of the line sensor 17 The line sensor 17 is moved by the value Δx01 after being corrected by the offset amount Δx.

FIGS. 6A to 6F are timing charts for explaining a method for detecting the number of rotation pulses of the photo interrupter 14.

In the figure, reference numeral 22a is a photo reflector 22.
The detection position by is shown.

In FIG. 6 (A), when the movement trajectory when the film 1 is continuously fed by using the perforations 1a and 1b is detected by the photo reflector 22,
From this photo reflector 22, as shown in FIG. 6 (B), high level, perforation 1 at the film position is obtained.
A pulse signal having a low level is obtained at the positions a and 1b.

When the film 1 is fed by one frame, the photoreflector 22 produces an output signal as shown in FIG. 6C.

At this time, when the photo interrupter 14 detects the rotation of the light shield plate 13 having the teeth and the comb teeth having the tooth narrowing angle of Δθ, as shown in FIG. 6D. Rotation pulse signal can be obtained.

On the other hand, FIG. 6E shows a signal output from the photoreflector 22 when the film 1 is rewound by one frame. At this time, the photointerrupter 14 outputs the signal shown in FIG. The rotation pulse signal as shown in FIG.

A method of detecting the offset amount Δx of the film 1 from the output signal as shown in FIG. 6 will be described.

When the film 1 is fed by one frame, as shown in FIG.
The point at which the film 1 is actually stopped at the second rising portion 32 in (C) and the film 1 is actually stopped is at the position indicated by reference numeral 33. At this time, the pulse number of the photo interrupter 14 due to the rotation of the driven roller 12 from the position indicated by reference numeral 32 to the position indicated by reference numeral 33 is Δn1.
The offset amount Δx1 is calculated with Δx1 being the offset amount of the film 1 corresponding to the pulse number Δn1.

When the film 1 is returned by one frame, FIG.
The point at which the film feed is braked at the second trailing portion 34 in (E) and the film 1 is actually stopped is at the position indicated by reference numeral 35. At this time, the pulse number of the photo interrupter 14 due to the rotation of the driven roller 12 from the position indicated by the reference numeral 34 to the position indicated by the reference numeral 35 is Δn2.
Then, the offset amount Δx2 is calculated by setting the offset amount of the film 1 corresponding to the pulse number Δn2 to Δx2.

Next, FIG. 8 is a main flowchart showing the operation of the image capturing device.

When the power is turned on, the main operation is started and the system control circuit section 24 and other circuits are reset.

Then, key input processing is performed based on the input from the input key operation circuit section 27 (step S1), the mode is determined (step S2), and the film feed motor drive circuit 25 causes the winding motor 6 to operate. Alternatively, drive control of the rewinding motor 9 is performed (step S3).

Next, the sub-scanning motor drive circuit section 28 controls the driving of the sub-scanning motor 21 (step S
4) Then, after performing various processes, it is determined whether or not a predetermined unit time has elapsed since the start of this main routine (step S5). It waits for the unit time to elapse, and then returns to step S1.

FIG. 9 is a flow chart showing the film feeding operation of the image capturing device in step S3 of FIG.

When this subroutine starts, it is judged whether the film 1 is to be fed or returned (step S1).
1) In the case of feeding, the hoisting motor 6 is driven (indicated as motor forward rotation in the drawing) (step S12), and it is determined whether or not the second rising edge is detected from the output of the photo reflector 22. (Step S14), this step S14 is repeated until it is detected.

On the other hand, when the film 1 is returned in step S11, the rewinding motor 9 is driven (indicated as motor reverse rotation in the figure) (step S13), and the photoreflector 2 is moved.
From the output of 2, it is determined whether or not the second falling edge is detected (step S15), and step S15 is repeated until it is detected.

Step S14 or Step S15
When each edge is detected by, the driven roller 1
The counting of the number of pulses of the photo interrupter 14 by the rotation of 2 is started (step S16), and the hoisting motor 6 or the rewinding motor 9 is braked (step S17).

When it is detected from the output of the photo interrupter 14 that the rotation of the driven roller 12 has stopped (step S18), the counting of the number of pulses of the photo interrupter 14 is terminated (step S19).

When the pulse number Δn of the photo interrupter 14 thus counted is detected (step S20),
Return and return to the main routine.

FIG. 10 is a flow chart showing details of the sub-scanning motor control in step S4 of FIG.

When this subroutine starts, it is determined whether the image capture button of the input key operation circuit unit 27 is on or off (step S21).

If the image capture button is off, this routine is finished as it is, and if it is on, the line sensor 17 is moved to the reset position as shown in FIG. 5 (step S22).

The offset amount Δ of the line sensor 17 is based on Δn detected in the flowchart of FIG.
x is calculated (step S23).

Then, the line sensor 17 is moved by the movement amount Δx01 in consideration of the offset amount Δx (step S24).

After that, the sub-scanning motor drive circuit unit 28
The sub-scanning motor 21 is driven by the line sensor 17
Sub-scanning is started (step S25), and when sub-scanning ends, the process returns and returns to the main routine.

Thus, the offset amount Δ of the film 1
The line sensor 17 is moved in consideration of x, that is, the offset amount Δx1 when one film 1 is fed, and the offset amount Δx2 when one film 1 is returned.

In order to detect the offset amount Δx with high accuracy, it is necessary to increase the number of comb teeth provided around the light shielding plate 13 (for example, about 500 teeth) to ensure high resolution. .

For various reasons such as the cost of parts, it is also possible to detect the offset amount of the film 1 by using the light shielding plate 13 provided with comb teeth having the number of teeth that are normally used (for example, about 15 teeth). is there. Such a modified example will be described below.

FIG. 11 is a timing chart showing the state of each part for detecting the offset amount. (A) is the film, (B) is the output signal of the photoreflector, and (C).
Is a curve showing the relationship between the transfer speed V and the time t when feeding one film of film, and (D) is the rotation pulse signal of the photo interrupter.

FIG. 12A is an enlarged view showing the output signal of the photoreflector shown in FIG. 11B.
11B is an enlarged view of the rotation pulse signal of the photo interrupter of FIG. 11D, and FIG. 13 is a further enlargement of the rotation pulse signal of the photo interrupter of FIG. 12B. It is a figure.

The point where the film 1 is stopped is where the right edge of the perforation 1b on the upper right of the exposure area 11 is detected by the photo reflector 22.

FIG. 11C is a graph showing the change in the film feeding speed. When the winding motor 6 is driven, the reference numeral 4 is given.
As shown in 3, the transfer speed of the film 1 is accelerated almost uniformly, and when the predetermined speed is reached, the film 1 is transferred while maintaining the speed as shown by reference numeral 44,
When the rising of the photo-reflector 22 is detected, the brake is applied, and as shown by the reference numeral 45, the photo-reflector 22 decelerates at a substantially constant acceleration and stops.

Offset amount Δx of film 1 at this time
Is the pulse width t00 during deceleration as shown in FIG.
It is calculated and obtained by detecting t01.

First, at the rising edge 42 of the photo interrupter, a signal for stopping the feeding of the film 1 is output.

The photo interrupter 1 shown in FIG.
In the rotation pulse signal of No. 4, the time from the falling signal portion 47 immediately before the stop to the rising edge 42 of the photo reflector 22 is set to t00, and the photo reflector 22
Assuming that the time from the rising edge 42 to the falling edge 48 of the photo interrupter 14 immediately before the stop is t01, the moving amount Δx0 of the film 1 shown in the figure is expressed by the following equation.

[0077]

[Equation 1] Here, x is a transfer distance of the film 1 corresponding to one pulse of the photo interrupter 14.

Here, assuming that a uniform acceleration motion is performed when the film 1 stops, a general formula of the uniform acceleration motion is shown below.

[0079]

[Equation 2]

(Equation 3) Here, V (0) is the initial velocity, α is the acceleration, and t is the time.

Based on these, V as shown in FIG.
Calculate 0 and V1. V0 is the average speed from time T to T0 and is the film feed speed at (T + T0) / 2. V1 is the average speed from time T0 to time T1 and is the film feeding speed at the time of (T0 + T1) / 2.

If the moving amount x of the film 1 per pulse of the photo interrupter 14 is constant, and the moving time per pulse is t0 and t1 in FIG.

(Equation 4)

(Equation 5) From the above formula 2,

(Equation 6)

(Equation 7) Substituting Equation 4, Equation 5, and Equation 7 into Equation 6,

(Equation 8) The film 1 decelerates at a constant acceleration with this acceleration α.

Next, the time Δt from the time point of (T0 + T1) / 2 to the stop of the film 1 is obtained.

When the film 1 stops, the speed is 0 (m
m / sec), substituting V = 0 into Equation 2 gives 0 = V1 + α · Δt. By substituting α obtained in Equation 8 into Δt to calculate Δt,

[Equation 9] Becomes Further, by substituting this equation 9 into equation 3,

(Equation 10) It is.

The distance ΔL from the last trailing edge to the stopping point as shown in FIG. 13 can be expressed by the following equation.

[0085]

[Equation 11] From the above, the offset amount Δxof is

(Equation 12) Is required. Here, n is the number of pulses of the photo interrupter 14 from when the brake is applied until the film 1 stops.

Further, by substituting the equations 1 and 11 into the equation 12,

(Equation 13) It is.

From the above, the offset correction amount Δxof of the film 1 is calculated at the times t00, t01, t0, t1, and x and n.
Can be obtained if is understood.

Thus, even when the number of teeth of the light shielding plate 13 is not very large, it is possible to calculate an appropriate offset amount by using the above formula.

According to the first embodiment as described above, the offset amount from the intended stop position at the time of feeding the film is detected, or the film feeding speed is detected and the offset amount is estimated to determine the line amount. By moving the sensor by the offset amount, the start position of the film reading range by the line sensor can be appropriately positioned.

Since the image in the exposed area of the film can be accurately read in this manner, the screen is not unsightly to the viewer.

Further, even when the number of comb teeth provided around the light shielding plate is not so large, it is possible to calculate an appropriate offset amount.

14 to 16 show a second embodiment of the present invention. In the second embodiment, description of the same parts as those of the first embodiment described above will be omitted, and mainly different points will be described.

In the above-described first embodiment, the offset amount is detected by counting the pulse of the photo interrupter 14 caused by the rotation of the driven roller 12 as the movement amount after the feeding of the film 1 is stopped. However, in the second embodiment, the offset amount is obtained by detecting the speed of the film 1 immediately before the feeding is stopped and calculating the moving amount until the film 1 is stopped based on this speed. It was done like this.

The structure of the image capturing apparatus of this embodiment is almost the same as that shown in FIGS.

In addition, FIGS. 5A, 5B and 11
Also shows the state in the second embodiment.

Offset amount Δx when the film 1 as shown in FIG. 5B is fed in the winding (one-frame feed) direction
Is increased in proportion to the film feeding speed V, as shown in FIG.

Therefore, the speed V is detected, the offset correction amount Δx corresponding thereto is calculated, and the line sensor 17 is moved by the movement amount Δx01 corrected by the calculated offset amount Δx.

FIGS. 14A to 14E are timing charts for explaining the method of detecting the feeding speed of the film 1.

In FIG. 14A, when the movement trajectory of the film 1 is detected by the photoreflector 22 using the perforations 1a and 1b of the film 1, FIG.
A pulse signal as shown in (B) is obtained.

When the rotation of the light shielding plate 13 as shown in FIG. 7 is detected by the photo interrupter 14, FIG.
A rotation pulse signal as shown in is obtained.

Here, the pulse width Δt (time) of the rotation pulse output from the photo interrupter 14 and the light shield plate 1
3 comb teeth sandwiching angle Δθ (see FIG. 7) and driven roller 1
The feeding speed V of the film 1 is obtained from the diameter D of 2. Here, the included angle Δθ and the diameter D are constants.

Therefore, the offset amount of the film 1 corresponding to the pulse width Δt may be calculated. Therefore, a method of detecting the pulse width Δt of the output of the photo interrupter 14 will be described below.

First, the positions of the perforations used for detecting the stop of the film 1 are shown below with FIG.

When the film 1 is fed in the film feed direction, when the photo reflector 22 comes to the right edge of the perforation 1b at the upper right of the third exposure area 11 from the left in FIG. The film 1 is stopped.

On the other hand, when the film 1 is being fed in the film returning direction, the photo reflector 22 is moved to the position shown in FIG.
When the right edge of the perforation 1b on the upper right of the second exposure area 11 from the left in (A) is reached, the film 1 is stopped.

Next, the pulse width Δt (time) of the film 1
A method of detecting the will be described.

The film 1 is exposed from the second exposure area 11 from the left to the third exposure area 11 from the left in FIG.
When one frame is sent, the photoreflector 22 outputs a signal as shown in FIG.

The pulse width Δt1 of the signal of the photo interrupter 14 of FIG. 14E immediately before the rising edge of the second pulse signal of FIG. 14C is detected.

When the film 1 is returned one frame from the second exposure area 11 from the left in FIG. 14A to the first exposure area 11 from the left, the photo reflector 22 is used.
Outputs a signal as shown in FIG.

The pulse width Δt2 of the signal of the photo interrupter 14 of FIG. 14E immediately before the fall of the second pulse signal of FIG. 14D is detected.

The offset amount Δx1 or the offset amount Δx2 of the film 1 to be corrected is calculated based on the pulse width Δt1 or the pulse width Δt2 thus detected.

Next, the main flow chart of the operation of the image capturing apparatus of this embodiment is the same as that shown in FIG.

FIG. 15 is a flow chart showing details of the film feeding motor control in step S3 of FIG.

When this subroutine starts, the count is reset to 0 and the initial flag is set (step S31).

Then, it is judged whether the film 1 is to be fed or returned (step S32).
Drive (indicated as motor forward rotation in the figure) (step S3
3), it is determined whether a rising edge is detected from the output of the photo reflector 22 (step S35).

In step S35, the photo reflector 2
If a rising edge is detected from the output of 2,
The pulse signals of the photo reflector 22 are counted (step S37). When the number of counted pulses is not 2, the process goes to step S41 described later, and when the number of pulses becomes 2 (step S38), the brake is applied (step S39), and the process returns and returns to the main flowchart (step S40). .

On the other hand, when the film 1 is returned in step S32, the rewinding motor 9 is driven (indicated as motor reverse rotation in the figure) (step S34), and the photo reflector 2 is moved.
It is determined from the output of No. 2 whether a falling edge has been detected (step S36).

In step S36, the photo reflector 2
If the output signal of 2 is the falling edge, go to step S37, and if it is not the falling edge,
Go to step S41 described later.

Next, it is judged whether or not the output of the photo interrupter 14 for detecting the rotation state of the driven roller 12 is the rising edge (step S41), and if it is the rising edge, the first flag is set. It is determined whether or not (step S42).

When the first flag is set, the first flag is cleared (step S44), and when the first flag is not set, the latest timer value corresponding to the feeding speed of the film 1 is read (step S43) and the timer is set. Is started (step S45).

When this step S45 is completed or when it is not the rising edge in the above step S41, the process returns to the above step S32.

FIG. 16 is a flow chart showing details of the sub-scanning motor control in step S4 of FIG.

More specifically, this subroutine shows the control at the time of capturing an image, and includes the drive control of the sub-scanning motor and the image pickup drive control of the main scanning.

When this subroutine starts, it is determined whether the image capture button of the input key operation circuit unit 27 is on or off (step S51).

If the image capture button is off, this routine is terminated as it is, and if it is on, the sub-scanning motor 21 is driven to bring the line sensor 17 to the reset position as shown in FIG. It moves (step S52).

The line sensor 1 is read by using the speed immediately before the film 1 is stopped, which is read in step S43 of FIG.
Only the feed amount Δx01 obtained by correcting the offset amount Δx of 7 is sent (step S53).

After the line sensor 17 has been fed by the feed amount Δx01, the sub-scanning is started and the image pickup by the line sensor 17 is started (step S54). When the image pickup is completed, the process returns and returns to the main routine.

According to the second embodiment as described above, it is possible to obtain substantially the same effect as that of the first embodiment.

17 to 20 show a third embodiment of the present invention. In the third embodiment, description of the same parts as those of the first and second embodiments described above will be omitted, and only different points will be mainly described.

In the first and second embodiments described above,
Although the offset amount is directly detected or the offset amount is calculated from the feeding speed, in the third embodiment, the offset amount depending on the film feeding speed and other factors is stored in advance, The sub-scanning motor driver is controlled based on the stored offset amount.
The offset amount differs between winding and rewinding.

The electrical construction of the image capturing device in this embodiment is as shown in FIG.

In other words, this image capturing device is capable of performing various input operations such as a mode input and an image capture input with the film feeding motor drive circuit section 25 for driving and controlling the winding motor 6 and the rewinding motor 9. An input key operation circuit unit 27 for performing the operation, a sub-scanning motor drive circuit unit 28 for driving and controlling the sub-scanning motor 21, an image pickup drive circuit 29 for driving and controlling the line sensor 17, and the above-mentioned circuits as a whole. And a system control circuit 24.

Next, FIG. 18 is a front view showing the image pickup device.

FIG. 18A shows a state in which the film 1 is stopped at a target position and there is no offset.

FIG. 18 (B) shows a state in which the film 1 is rewound to cause an offset amount a in the rewinding direction. This offset amount a
Has various values depending on the feeding speed of the film 1.

The feeding speed of this film 1 is
It changes depending on various factors such as the number of frames to be wound up or rewound, the number of frames to be fed, and the environment. Therefore,
Let δa be the variation amount that changes due to factors such as the number of frames and the environment.

This variation amount δa is δa <a from the experiment.
Therefore, the minimum necessary offset amount to be corrected is a. Therefore, this offset amount is
When the film 1 is rewound, only a is the line sensor 1
Correct by shifting 7.

FIG. 18C shows a state in which an offset amount b is generated in the winding direction by winding the film 1.

Also in this case, as in the case described with reference to FIG. 18B, the minimum necessary offset amount to be corrected is b. Therefore, this offset amount is corrected by shifting the line sensor 17 by b when the film 1 is wound up.

The above-described operation will be described with reference to FIG. 20 and in accordance with the flowchart of FIG.

When the operation starts, it is determined whether the image capture button of the input key operation circuit unit 27 is on or off (step S61), and if it is off, the process ends.

On the other hand, when the image capture button is on, the line sensor 17 shown in FIG.
As shown in (B), it moves to the reset position 17r (step S62). The reset position 17r is detected by a sensor such as a photo reflector (not shown).

Next, it is determined whether the film 1 is to be fed or returned (step S63). If the film is fed, the state shown in FIG. The offset correction amount b is calculated (step S65), and the process proceeds to step S66 described later.

On the other hand, when the film is returned in step S63, the offset correction amount a of the line sensor 17 is calculated because the state is as shown in FIG. 20D (step S64).

Then, the line sensor 17 is moved by the movement amount Δxa or Δxb (see FIGS. 20C and 20D) after being corrected by the calculated offset amount a or offset amount b (step S66). .

When the movement is completed, the reading of the image in the exposure area 11 is started (step S67), and when the reading is completed, the process returns to the main flow chart.

In the third embodiment, the offset correction amount a and the offset correction amount b are stored in the ROM in the system control circuit 24 constituted by a one-chip microcomputer or the like. For example, the system control circuit 2 is not limited to this.
4 may be an external memory. In this case, if an electrically rewritable non-volatile memory such as an EEPROM is used as the external memory, the offset correction amount a and the offset correction amount b can be written and saved according to the variation of each device. .

According to the third embodiment as described above, substantially the same effects as those of the above-described first and second embodiments are obtained, and the offset amount from the intended stop position at the time of feeding the film is determined. The start position of the film reading range can be determined in advance by moving the line sensor by a constant offset amount depending on whether the film is sent or returned.

[Additional Remarks] According to the above embodiment of the present invention, the following configuration can be obtained.

(1) An image pickup means for converting an image recorded on a film into a video signal, a feeding means for feeding the film, and a film fed and stopped by the feeding means. A means for obtaining an offset amount from the target stop position to the actually stopped position, and a positioning means for determining the start position of the sub-scanning image capturing of the image pickup means based on the offset amount obtained by this means. An image capturing device characterized by being provided.

(2) The image capturing device has a moving amount detecting means for detecting the moving amount of the film by the feeding means, and the means for obtaining the offset amount is the actual stop position from the target stop position. The image capturing device according to (1), wherein the movement amount to the stop position is detected by the movement amount detecting means.

(3) The image capturing device has a feeding speed detecting means for detecting an amount relating to the feeding speed of the film by the feeding means, and the means for obtaining the offset amount is the feeding speed. The image capturing device according to (1) above, wherein an offset amount from the target stop position to the actual stop position is calculated by calculation based on the feeding speed of the silver salt film detected by the feeding speed detection means. .

(4) The image capturing device has a storage means for storing the offset amount in advance, and the means for obtaining the offset amount reads the offset amount stored in the storage means (1). The image capturing device described in.

(5) The storage means stores offset amounts corresponding to winding and rewinding, and the means for obtaining the offset amount selects the offset amount according to winding or rewinding. The image capturing device according to 4).

(6) The film has a hole for positioning, the image capturing device has a hole detecting means for detecting the hole, and the feeding means has a hole detecting means. The image capturing device according to (1), wherein the film is stopped at the target stop position based on the output.

(7) It has a feeding means for controlling feeding and rewinding of the silver salt film, a line sensor, and a sub-scanning means for moving the line sensor, and the recording is performed on the silver salt film. An image capturing device for converting an image into a video signal, wherein an image capturing start position of the sub-scanning device is changed according to the winding and the rewinding.

(8) A feeding means for controlling the feeding of the silver salt film, a line sensor, and a sub-scanning means for moving the line sensor are provided, and the image recorded on the silver salt film is converted into a video signal. And an image pickup means for converting, and actually measuring or predicting an offset amount from a target stop position to an actual stop position when the feeding by the feeding means is stopped, and the measured or predicted offset amount An image capturing device for controlling the image capturing start position by the sub-scanning means based on the above.

According to the image capturing device described in (1) above, the image capturing position can be accurately determined.

According to the image capturing device described in (2) above, since the offset amount is measured, the capturing position can be accurately positioned.

According to the image capturing device described in (3) above, the offset amount is predicted from the film feeding speed, so that the feeding speed can be determined by the feeding speed detecting means such as an encoder with normal accuracy. A sufficient offset amount can be predicted.

According to the image capturing device described in (4) above, since the offset amount is stored in advance, the structure is simplified.

According to the image capturing device described in (5) above, different offset amounts can be set at the time of winding and rewinding, and more accurate positioning control can be performed.

According to the image capturing device described in (6) above, it is possible to accurately stop the feeding of the film.

According to the image capturing device described in (7) above, the image capturing position can be accurately determined, and the image is easy to see.

According to the image capturing device described in (8) above, the image capturing position can be accurately determined, and the image is easy to see.

[0166]

As described above, according to the image capturing apparatus of the present invention described in claim 1, the image capturing position can be accurately determined.

According to the image capturing device of the present invention as defined in claim 2, since the offset amount is actually measured, the capturing position can be accurately positioned.

Further, according to the image capturing apparatus of the present invention as defined in claim 3, since the offset amount is predicted from the film feeding speed, the feeding speed obtained by the feeding speed detecting means of ordinary accuracy. Can predict a sufficient offset amount.

As described above, according to the image capturing apparatus of the present invention, it is possible to make the image easy to see without outputting unnecessary images.

[Brief description of drawings]

FIG. 1 is a perspective view showing an image capturing device according to a first embodiment of the present invention.

FIG. 2A is a plan view and FIG. 2B is a front view showing the image capturing device of the first embodiment.

FIG. 3 is a diagram showing a relationship between a film transfer speed and an offset amount of the first embodiment.

FIG. 4 is a block diagram mainly showing an electrical configuration of the image capturing device of the first embodiment.

FIG. 5 is a front view showing the image capturing device when (A) the film stops at a predetermined position and (B) when an offset occurs in the first embodiment.

FIG. 6 is a diagram showing the image capturing device of the first embodiment,
(A) Film, (B) Photoreflector output signal when continuously feeding film, (C) Photoreflector output signal when one frame of film is fed, (D) Photo when one frame of film is fed Interrupter pulse signal,
(E) A timing chart showing the output signal of the photo reflector when returning the film by one frame, and (F) the pulse signal of the photo interrupter when returning the film by one frame.

FIG. 7 is a plan view showing the light shielding plate of the first embodiment.

FIG. 8 is a main flowchart of the image capturing device according to the first embodiment.

9 is a flowchart showing details of the film feeding motor control in step S3 of FIG.

10 is a flowchart showing details of sub-scanning motor control in step S4 of FIG.

FIGS. 11A and 11B are (A) film and (B) for detecting an offset amount in the image capturing device of the first embodiment.
Output signal of photoreflector, (C) Curve showing the relationship between transport speed V and time t when feeding one frame of film, (D)
The timing chart which shows the rotation pulse signal of a photo interrupter.

FIG. 12 shows the above-described first embodiment (A) above FIG.
The figure which expands and shows the output signal of the photoreflector of (B), and (B) the figure which expands and shows the rotation pulse signal of the photo interrupter of the above-mentioned FIG. 11 (D).

FIG. 13 shows the above-mentioned FIG. 12 (B) in the first embodiment.
The figure which further expands and shows the rotation pulse signal of the photo interrupter of FIG.

FIG. 14 is an image capturing apparatus according to the second embodiment of the present invention, in which (A) film, (B) photoreflector output signal, (C) photoreflector output signal when feeding one frame of film, and (D) ) A timing chart showing the output signal of the photo reflector and (E) the pulse signal of the photo interrupter when the film is returned by one frame.

15 is a flowchart showing details of the film feeding motor control of the second embodiment in step S3 of FIG.

16 is a flowchart showing details of sub-scanning motor control of the second embodiment in step S4 of FIG.

FIG. 17 is a block diagram mainly showing the electrical configuration of an image capturing device according to a third embodiment of the present invention.

18A and 18B, in the third embodiment, (A) when the film stops at a predetermined position, (B) when an offset occurs in the rewinding direction, and (C) when an offset occurs in the winding direction. The front view which shows the image pick-up device of.

FIG. 19 is a flowchart showing the operation of the image capturing device of the third embodiment.

FIG. 20 is a diagram showing a state where (A) the line sensor is in the initial state, (B) the line sensor is reset, and (C) an offset occurs in the winding direction in the third embodiment.
(D) A front view showing the image capturing device in a state where an offset occurs in the rewinding direction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Film (silver salt film) 6 ... Winding motor (feeding means) 9 ... Rewinding motor (feeding means) 14 ... Photo interrupter (means for obtaining offset amount, movement amount detecting means) 15 ... Light source (light source means) ) 17: line sensor (part of image pickup means) 21 ... sub-scanning motor (sub-scanning means, part of image pickup means) 22 ... photoreflector (means for obtaining an offset amount,
Moving amount detecting means) 24 ... System control circuit (positioning means, feeding speed detecting means)

Claims (3)

[Claims] 1. A light source means for illuminating a developed silver salt film, a line sensor, and a sub-scanning means for moving the line sensor, and an image recorded on the silver salt film illuminated by the light source means. An image pickup means for converting into a video signal, a feeding means for feeding the silver salt film, and a feeding stop of the silver salt film fed and stopped by the feeding means from an intended stop position. Based on the means for obtaining the offset amount from the position and the offset amount obtained by this means,
An image capturing device comprising: a positioning unit that determines a start position of capturing of a sub-scanning image by the sub-scanning unit of the image capturing unit. 2. The image capturing device has a movement amount detecting means for detecting the movement amount of the silver salt film by the feeding means, and the means for obtaining the offset amount is from the target stop position to the above-mentioned stop position. The image capturing device according to claim 1, wherein the movement amount to the actual stop position is detected by the movement amount detecting means. 3. The image capturing device has a feeding speed detecting means for detecting an amount related to the feeding speed of the silver salt film by the feeding means, and the means for obtaining the offset amount is the above-mentioned means. The image capturing device according to claim 1, wherein the offset amount from the target stop position to the actual stop position is calculated by calculation based on the feed speed of the silver salt film detected by the feed speed detection means. .