JPH03278041A - Data imprinting device for camera - Google Patents

Abstract

PURPOSE:To properly imprint data even when the speed of a film is changed while a camera is made compact by detecting the edges of both directions of a pulse generated according to the feeding of the film and imprinting a dot synchronously with it. CONSTITUTION:Timing signal generation means 91 - 95 which detect the leading edge and the trailing edge of the pulse from a pulse signal generation means 23 and generate imprinting timing signals synchronously with the respective edges and an imprinting control means 1 which drives imprinting means 40 - 48 and makes them execute imprinting based on the imprinting timing signal are provided. Thus, not only the edge of one direction but also the edges of both directions of the pulse generated according to the feeding of the film can be detected and the dot can be imprinted synchronously with it. As the result, the data is properly imprinted even when the speed of the film is changed while the camera is made compact.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention provides data for a dot imprinting camera that detects the movement of a film and flashes a light emitting element in synchronization with the movement to form characters, etc. on the film surface. This invention relates to improvements to imprinting devices.

(Background of the Invention) In order to imprint images at fine intervals on a film, it is necessary to precisely detect the position of the film being fed. For this reason, it is advantageous in terms of manufacturing and cost to use a pulse plate printed with fine pulse generating parts (bright and dark pitches) and a transmissive photo ink printer with a narrow slit width. However, there is a limit to the ability to create a bright and dark pitch on a pulse plate by printing, and the minimum pitch, or number of pulses per rotation, is determined by the diameter of the pulse plate. Also, although the above-mentioned pulse plate is rotated in synchronization with the feeding of the film, there is also a method in which a gear is inserted midway to increase the speed and the pulse plate is rotated multiple times for each frame of film fed. The play in the gears in the middle is equal to the number of gears, which goes against the demand for fine, high-precision film position detection. At the same time, if a single gear is used to increase the speed increase ratio, the gear must be made larger in order to increase the gear ratio, which impairs the compactness of the camera.

Therefore, conventionally, the edge of the output pulse of the photo ink club in one direction is captured, the interval between them is counted, and a dummy pulse is generated when half of the previously counted time is counted from the detection of the next edge. A method has been implemented in which a pseudo-doubling circuit is configured by adding a dummy pulse generation circuit to obtain more pulses with a small-diameter pulse plate, but this doubling circuit has a large circuit scale and requires an IC.
Moreover, when the film speed fluctuates greatly, there is a problem that the printing interval varies greatly.

(Object of the Invention) The object of the present invention is to solve the above-mentioned problems and to provide a camera data copying system that can make the camera more compact and that can imprint appropriate data even if the film speed changes. The purpose of the present invention is to provide an embedded device.

(Features of the Invention) In order to achieve the above object, the present invention provides a timing signal generator that detects the rising and falling edges of a pulse from a pulse signal generating means and generates an imprint timing signal in synchronization with each edge. and an imprinting control means for driving the imprinting means to perform imprinting based on the imprinting timing signal from the timing signal generating means, thereby controlling the pulses generated in response to film feeding. The present invention is characterized in that not only edges in one direction but also edges in both directions are detected and dot imprinting is performed in synchronization with this.

(Embodiment of the Invention) An embodiment of the present invention will be described based on FIGS. 1 to 23.

In Figure 1, l is a microcomputer that controls the sequence (
μmC0M), 2 is ROM that stores programs and character font patterns, 3 is RA that stores data
M, 4 is a data bus, 5 is an address bus, and 6 is a control bus. 7 is a battery that supplies power to the electrical system; 8 is a voltage detection circuit that detects the voltage of battery 7 and generates a reset pulse when the battery is turned on or when the voltage of battery 7 falls below a predetermined level; and 9 is a voltage detection circuit that synchronizes the system. This is an oscillation circuit (OSC) that generates pulses that serve as a reference for watches and calendars. 10 is a frequency divider circuit that divides the output of the oscillation circuit 9 to generate daily pulses; 11 is a day counter; 12 is a month counter; and 13 is a year counter; their respective carry-in and out terminals are connected (not shown). It is provided to function as an autocalendar together with the month-end correction circuit. In addition, each output is a BCDX 2-digit counter signal for each port (DAYL, DAYL,
DAYH.

MTHL, MTHH, YERL, and YER are input to the old terminal, and are also input to the LCD driver 14. Here, L and H indicate the 1st digit and the 10th digit, respectively.

Reference numeral 15 denotes an LCD display section placed on the top surface of the camera, etc., for checking the imprinted calendar and displaying the message selection status.As shown in an enlarged view in FIG. , 15e) and a message selection state display section 15d.

Reference numeral 16 denotes a camera control circuit, which performs AE by pressing a shirt release switch (not shown).

A series of camera sequences such as AF, shutter, winding, and rewinding are controlled according to known methods. Reference numeral 17 denotes a driver for a wind motor 18 that winds the film after the photographing operation is completed according to instructions from the camera control circuit 16. 19
20 is a message selection switch for changing the content of the message to be recorded on the film; 20 is a 5-ary message counter for counting the message mode; the counter is configured to advance the counting state by 1 each time the message selection switch 19 is pressed. There is. This counter value is sent to the input port ME of microcontroller 1 as 3-bit binary data.
At the same time, it is also input to the LCD driver 14 that displays the message selection status.

21 is an imprint mode changeover switch for switching whether the data to be imprinted is a calendar or a message;
The state is input to the input port (CAL) of the microcomputer 1 and also to the LCD driver 14.

22 is a D flip-flop (hereinafter abbreviated as D-F/F) that monitors the input of the imprinting clock; 23 is a photointerrupter that detects a film feeding pulse, which will be described later; and 23a is an LED that is a component thereof. , and 23b is a phototransistor.

24 is a variable constant current circuit which is a driver for the LED 23a, 25 is a rotary plate (pulse plate) that generates pulses that rotate in conjunction with film feeding, and 26 is a converter for converting the AC signal output from the photointerrupter into a logic signal. The photointerrupter detection circuit 27 is a one-shot circuit that outputs a one-shot pulse of a predetermined time based on the edge input of each rising and falling pulse of the photointerrupter detection circuit 26. This predetermined time is determined by, for example, 3-bit film sensitivity information input from the camera control circuit 16.

28 is an inverter, 30 to 38 are 3-person AND gates,
39 is an 8-channel LED driver, 40 to 48 are dot LEDs for imprinting, and 49 to 51 are pull-up resistors for each switch. Reference numerals 57 to 59 are correction switches corresponding to each digit of the calendar, and 60 to 62 are correction pulse generation circuits that input correction pulses to each counter by inputting these switches.

63 is a D-F/F configured so that the output is inverted each time the mode selector switch 21 is pressed, and its Q output is connected to the input port 1 PCAL (indicated by CAL in the figure) of the microcomputer 1, and the output is The mode is controlled.

64 is an AND gate, 65 is an OR gate, and 66 is a one-shot circuit which receives the camera winding motor control signal and outputs a pulse of a predetermined time by inputting the falling edge of the control signal.

In this embodiment, the AND gate 64 is provided in a three-man type, and its input is applied to the Q output of the mode selector switch 21, the output of the one-shot circuit 66, and a cancel switch that cancels the automatic mode return operation. 80
Normally (when the cancel switch 80 shown in FIG. 1 is in the OFF state), the one-shot pulse generator circuit 66 outputs the output when the wind motor 18 stops driving.
The DF/F 63 is reset by the output of , but when the cancel switch 80 is turned on, the DF/F 63 is configured so that it will not be reset even by the input of the one-shot pulse generation circuit 66 . With this configuration, in this embodiment, the message data imprint mode (second mode) is normally reset every time a shooting operation is performed and returns to the standard date data imprint mode (first mode), but if cancelled, When the switch 80 is pressed (on), the same message data is repeatedly imprinted. Note that 81 is a pull-up resistor.

FIG. 2 is a diagram schematically showing the dot scan imprinting method, and the same components as in FIG. 1 are given the same numbers.

40 to 48 are dot LEDs arranged in the example described above;
51.53 is a roller that rotates at the same time as the film moves;
52 is a film take-up spool, 54 is a cartridge, 5
5 is a projection lens, and 56 is a film. 25 is a rotating plate for generating pulses which is integrally connected to the roller 51, and 23 is the aforementioned transmission type photointerrupter.

Figure 3 shows the LCD display section 15 installed on the outer surface of the camera.
15a is a half phase display section of the calendar, and 15b and 15c are moon phase and day digit display sections of the calendar, respectively. 15d-1 to 15d-5 are message type display segments that light up in the message imprinting mode.

On the right side, the message content (“HAP”) is displayed on the surface of the camera.
PY BIRTHDAY'88" (short sentences such as "PY BIRTHDAY'88") are printed on the screen, and by turning on one of these, the user can confirm which message is currently selected and will be imprinted on the film. ing.

Next, various switches around the LCD display section 15 will be explained.

The message selection switch 19 is a switch that becomes effective when the message mode is selected by the imprint mode changeover (date/message changeover) switch 21, which is a switch for selecting the imprint mode. At the same time, the messages on the LC are changed in order.
The D display section 15 is configured so that the currently selected message can be confirmed by switching the arrow segments 15d-1-15d to 5 and turning them on in order. Each time the imprinting mode selector switch 21 of this example is pressed, it can be switched between a calendar and a message that correspond to the imprinting contents, and when the calendar (date) is selected (the state shown in Fig. 3), it is set to the right end. All of the arrow segments 15d-1 to 15d-5 are turned off, and conversely, when a message is selected, the calendar display sections 15a to 15c and 15e are turned off.

Reference numerals 57 to 59 are switches for modifying the date imprinted calendar, and are configured to correspond to the respective digits of "Year", "Month J", and "Day J" and can be directly modified.

FIG. 4 is a timing chart showing the timing of film feeding pulses and font output during imprinting.

Figure 5 shows a specific example of imprint data, and shows the font output when displaying "...C, B, A" on a photo print (see Figure 5 (B)). As shown in Figure 0, which is a diagram for explaining the sequence, in this embodiment, the font output is determined by the placement positions of the camera cartridge 54, film take-up spool 52 (see Figure 2), and dot LEDs. The rightmost character r A J (DiGiO) in Figure 5 (B) of the character string you are trying to perform (Figure 5 (
In A), the configuration is such that the font data AO at the left end is output in order. The left end of Figure 5 (A) is (9X7)
It shows the boat of microcomputer 1 that outputs data when imprinting with dot font, and from the bottom DO
~4 bits of D3 are Kano LEDL boat, 4 of D4~D7
Bit is an OPLEDM boat, the top Do-D3 4
The bits (of which D1 to D3 are not used) have leaf LEDs.
) l boats are assigned to each.

Figures 6 and 7 are diagrams showing a method for creating a (7x5) dot font pattern from a (9x7) dot font as the film screen size changes. If we assume that the vertical direction is a row and the horizontal direction is a column, reduction in the row direction involves extracting part of the data, D 2 (2") of the LEDBL and D 6 (2") of the LEDBM in Figure 6, and reducing the remaining data. This is done by compressing the data in the lower order.
Further, reduction in the column direction is achieved by skipping predetermined addresses (AI and A5 in the example in FIG. 7) when outputting the font to the boat.

FIG. 8 shows part of the font data stored in the font data table in the ROM. The address is shown in 12 bits, and the data is written in 8-bit units. The bit corresponding to the black part is “l” and the others are “0”
This is the data. In other words, ll'7AO~H"7AF is the font of A",)l'7BO~I('78F is the font of "B"
,)I'7CO~H'? CF is "C" 1 ('700~H
'70F is "D"...H'860~H'86F is "
M″H”8BO~H”BBF is “R”H’8FO~
H'8FF indicates "V" font data.

9 to 13 are flowcharts illustrating the sequence of the program.

FIG. 14 shows a photo interrupter detection circuit 26 that detects a photo ink interrupter signal generated in response to film feeding.
3 is a diagram showing details of a one-shot circuit 27 and a variable constant current circuit 24. FIG. The same parts as in FIG. 1 are given the same numbers.

In FIG. 14, 82 is a resistor, 83 is a resistor that converts the output current of the photointerrupter 23 into voltage, and 84 is a PN
P resistance for drawing base current of transistor 85;
86 is an NPN transistor that operates to keep the emitter voltage of PNP transistor 85 at a constant voltage (Vref), 88 is a comparator, 89 is an inverter, 90 is an AN
This is the D gate. 91 is the LE of the photo interrupter 23
D Resistor for current detection, 92 is NPN for constant current drive
93 is an operational amplifier, 94 is a DA converter, and 95 is a current setting circuit that adjusts a digital current value to the DA converter 94 as described later.

FIG. 15 shows a timing chart when the threshold voltage (Vcf) is appropriate for the photointerrupter signal, and FIG. 16 shows a timing chart when the threshold voltage (Vcf) is incorrect. Further, FIGS. 17 to 18 are diagrams showing the imprinting situation in proper cases and in improper cases.

FIG. 19 shows the input/output ports of the microcomputer 1, the number of bits, and their contents, and FIGS. 20 and 21 show the data memory in the RAM and its contents 1.2.

Figure 22 is a diagram showing the addresses of font data in the ROM and the fonts stored therein. The stored fonts are numbers O to 9, alphabets A to Z, and 10 types of symbols, for a total of 46 fonts. be.

FIG. 23 is a diagram showing the numerical value of the message counter and the contents of the message corresponding to the count value.

In the above configuration, when the camera is powered on, the voltage detection circuit 8 outputs a reset pulse. When this reset pulse is input to microcomputer 1, 5TA in FIG.
Start the sequence from RT. In addition, this reset pulse is simultaneously applied to the frequency divider circuit 10 and each counter 1 on September 1st.
1-13, the message counter 20 is also input, so these are also reset.

First, in step #0 old, the memory in the RAM area is cleared, in steps #002 to 004, "0" is output to the dot LED lighting control board (OPLEDL-14), and in step #005, the imprint pulse detector is Reset D-F/F22. Next, in step #007, the process waits for data imprinting to be enabled.

Now, when the release switch (not shown) is pressed with film loaded in the camera and shooting is completed, the first
In the figure, a signal is output from the camera control circuit 16 to drive the wind motor 18 for film winding.
The film is wound, but this motor drive signal is input from the 1PDEN boat into the microcomputer 1, and the 1P
DEN=1 and the sequence proceeds to step #008.

In step #008, the imprint mode is determined, and it is determined that it is the date calendar mode, that is, (iPcA
If the value is 1), the address of the font for imprinting only the calendar data is set in step #011. Here, first imprint the lowest digit (old GiTO
) by loading the first digit of the calendar day digit (DAYL) into the middle address (PDOM) for font instruction and loading "7" into the upper address, refer to the ROM font table (Figure 22). Then, the upper address is “7”.
'', the same font as the value of the middle address is stored, so in this case, the font specification of the lowest digit for imprinting becomes the value of the first digit (DAYL) of the calendar day digit. Similarly, the next digit to be imprinted is the 10th digit (DA) of the calendar moon phase.
YH). Next, the third digit from the lowest digit to be imprinted (
The font specified for DiGiT2) is a blank font because the middle address (PD2M) is "5" and the upper address (PO2)1) is "9" (FIG. 22).

From then on, in the same way, DiGiT3 records the first digit of the moon phase, Di
GiT4 has the 10th digit of the moon phase, DiGi6 has the 1st digit of the year, DiGiT7 has the 10th digit of the year, and DiGiT8 has "(
single quotation), DiGiT5 and Di
For GiT9 to DiGiT1, the addresses of blank fonts are loaded, respectively.

On the other hand, in step #008 it is determined that it is the message mode (i
PcAL.0), the type of message to be imprinted is determined by determining the value of the message counter 20 in steps #009 to #O1O, and an address for specifying the font is set. FIG. 10 shows each imprint message and the font address set in each imprint column. In this embodiment, if the content of the message counter 20 is, for example, "0", "HAP
The message ``PY BIRTHDAY'' and the data ``Year'' are imprinted.

In other words, DiGiTO and DiGiTl have fonts (yL and y
H), DiGiT2 sets ", (single quotation), DiGiT3 to DiGiT17 sets "YAD) ITRIB 1. JYPP/II u
(U indicates blank) and the font address are loaded, and in this case, the font is set from the last character as described above, so r, H on the print
The font is specified so that APPY,, 81RTHDAY'88 J (Note: If the half phase of the calendar is 1988, yL=yH=8) is displayed. Similarly, if the message counter is "1", rMERRY u
CHRISTMAS'y)lyt.

”, if the counter value is “2”, then r, , , , C0N
GRATULATTONS I J, if the counter value is "3", then "-..., I LOVE YOU
! J, if the counter value is "4", then "...
THANK YOU! J is imprinted.

It will be understood from FIG. 1O that when the counter values are r2J, r3J, and r4J, the "year" of the date data is not imprinted.

Next, when the mode is determined and the font is specified as described above, the DATSET subroutine is called in step #O12, and the actual font is output.

The above DATSET subroutine will be explained with reference to the flowchart of FIG.

First, in step #100, the first digit to be imprinted (
(Lowest digit on print) Middle digit of DiGiTO font specification address: Specifies the address when referring to the data table in ROM for the contents of PDOM 1
Middle digit of a 2-bit (4 bits x 3) counter, DA
Load into CM.

Next, in step #101, after similarly loading the contents of PDOH, the upper digit of the font designation address, into the upper digit of the data counter, 0ACH, the FNTOUT subroutine for actually outputting the font is called. Here, if you want to output the font "A" with DiGiTO, change OACM and DACH to DACH.
・7. Set OACM=A.

The above FNTOIJT subroutine will now be explained with reference to the flowchart of FIG.

First, in step #200, the lower digit (D
ACL) is set to "0", the film screen size is determined using #2 old, and if it is determined to be full size (iP(FiLS)・l), the process proceeds to step #202, where the D-F/F for imprint pulse detection is determined. The reset of F22 is canceled by setting LAR3T=L. Next, in step #203, the lower 4 bits (DACL), which are the contents of the ROM address data specified by the data counter and DAC, are output to the LEDL port. In other words, to explain the case where "A" is output with the aforementioned DiGiTO, the data counter: DA
Since the content of C is H'7AO, the lower 4 bits of the data of the 8-bit M address are B'1llll (see the font diagram of "A" at the upper left corner of FIG. 8).

Next, in step #204, R specified by the data counter
The upper 4 bits (DACH), which are the contents of the data stored in the OM address, are output to the 0PLEDH port. (In the case of the font "A" mentioned above, it becomes "B"0011), and then in step #205, the lower digits of the data counter, and the lower 4 bits of the ROM address specified by the data counter with "8" added to DACL. 0P data
LFD) Output to I boat. If “A”, DAC=H
'788, and the lower 4 bit data becomes B'0000. In the embodiment, the upper 3 bits are actually connected to the output port, but in this way step #203. Step #204.
In step #206, font data is output to the LED lighting control output ports (LEDL-DPLEDH). The sequence is to subtract "7" from DACL in step #207, and step #2
08, the input of the rising edge of the imprint pulse is waited. When the rising edge enters the clock of the DF/F 22, its Q output becomes H (iPEDEcT=)I), and the process proceeds to step #209, where the DF/F 22 is reset. Here, regarding the actual lighting time of the dot LED, as shown in the timing chart in Figure 4, the dot LED lighting is based on the output 9 bits of the font (LEDLO~3.LED
MO~3. Since it is the AND of three signals: Lε0HO), the imprint pulse invert signal, and the imprint enable signal (see Figure 1), the LED lighting period is the imprinting time for the bits output by rlJ to the font output port. Limited to the low level period of the pulse (DCLK). Also, the reason why the rising edge of the imprint pulse (DCLK) is detected in step #208 and D-F/F22 is to detect the end of the LED light for one line of the font and set the next font data. It is.

Next, in step #210, the lower digit 20A of the data counter
It is determined whether CL has become "8", and if it is less than "8", the process from step #201 is performed again. In other words, from then on, add "8" to the lower digit of the data counter: DACM in the previous flow so that the next line of the font is output (
#205), "7" is subtracted (#207), so the result is "+1", and the data counter and DAC specify the data of the next column.

In the case of "A", (DAC) becomes H'7A1.

Here, when the output of the last column is finished (in the case of “A”, H
'7＾7and)I'? AF), DACL becomes "8", branches at step #21O, and returns to subroutine FNTOIJ.
Finish T and return.

On the other hand, when the screen size is determined to be half size in step #2 old (FiLS), the processing is slightly different, and remains the same until the reset of the imprint pulse detection El-F/F 22 is canceled in step #211. Yes, but step #2
12 and the lower digit of the data counter starts from "1",
By incrementing DACL by 1 in step #217, and by skipping if DACL is "1" or "5", A1 and A5 are added from the (9X7) font.
2 rows are removed, and the 2 rows are 5 rows (Figure 7 (B)
)reference). Then step #213. Step #215
The data at the ROM address specified by the data counter is directly sent to the LED light output port (OPLEDLNM).
Since it does not output to -bearing buffer RAM, LEDBL,
Move LEDBM into LEDBH, step #21
Subroutine DATS to shift part of the data at 8
will be called.

This DATS subroutine will be explained with reference to FIG.

In other words, in step #3 old, the 23 digits of the contents of LEDBL (
In FIG. 13, (LEDBL) (same as display 2 and below) is determined, and the value is transferred to the 22nd digit (#302.30).

Determine the 2° digit of LEDBM in step #304 and transfer the value to the 23rd digit of LEDBL (#305.306)
.

In step #307, the 22nd digit of the LEDBM is determined, and the value is transferred to the 2° digit of the LEDBM (#308, 309).

Determine the 23rd digit of the LEDBM in step #310 and move the value to the 21st digit of the LEDBM (#311.312)
.

In step #313, determine the 2° digit of LEDB)l and move the value to the 22nd digit of LEDBM (#314, 315)
.

By setting the 23rd digit of LEDBM to "0" in step #316 and setting LEDBH to H'O in step #317 (see Figure 6 above), D2 and D6 from the (9X7) font
By removing the two rows of data and shifting it to the lower digits, the number of rows becomes seven (see Figure 7 (B)!).

Now, when this data shift process is completed, the data shifted in steps #219 to #221 in FIG.
0PLEDH). The subsequent processing is the same as for full size (#208 to #210...),
When the imprint font for one character is finished outputting in this way, D
Since ACL=8, FNTO is started from step #210.
After exiting the subroutine υ, the font for the next character (DiGiTI) is output from step #103. The subsequent output of each character is the same as in DiGiTO, and D
By setting the start address of the font for each character in the ATSET subroutine and calling the FNTOIIT subroutine, the LE mouth ratio output port for the actual font is output.

Here, the last column (A7) of the font for each character contains a blank pattern for one column, so (DACL・H'
7 or H'F) One dot blank will be inserted between each imprint character.

Now, after outputting up to the last character (DiGiTI7), the DATSET subroutine returns and the 9th
At step #O13 in the figure, wait until the wind motor 18 stops and imprinting is disabled, and when it is disabled, the state waits for the imprinting to be performed again (see step #007), - Finish the street imprinting sequence.

Note that since a (7x5) dot font is created from a (9x7) dot font, it is necessary to select a font pattern that does not cause any inconvenience in terms of shape or design, since data is omitted and compressed using a certain pattern. One thing goes without saying.

In the embodiment shown in FIG. 3, when the imprint mode is calendar, only the order of "January 1, 2018" is prepared, so the half phase display section 15a, the moon phase display section 15b, and the day digit display section 15c and a single quotation mark 15e that indicates the year, but in addition to this, if you want to display an English string or a timetable, you may add more segments for that purpose. The device has a feature that if the above operation is set to message mode (second mode) for imprinting, the device automatically returns to date data imprint mode (first mode) after the camera is released. be.

That is, in the device of this embodiment, as already mentioned above,
After the camera release, a falling edge is input to the one-shot pulse generation circuit 66 at the timing when the winding operation ends. Since the one-shot pulse generation circuit 66 generates a pulse for a predetermined time, the cancel switch 80 is activated at this time.
is on (normal), if the Q output of DF/F63 is H, the output of OR gate 65 is also H, and D-F/F6
3 is reset. When reset, the D-F/F
Since the Q output of 63 becomes H, the 1PCAL input of microcomputer 1 becomes H, and the imprint mode becomes date mode.

Furthermore, since this Q output is also input to the LCD driver 14, the external LCD display section 15 is also switched to the content corresponding to the mote.

However, if the cancel switch 80 is turned off (the automatic mode return is canceled), the above automatic return is not performed, and multiple images can be taken with the same message imprinted. Note that the cancel switch 80 may be linked so that it is normally on when the power is turned on/off or when the film is replaced.

Next, a method for detecting a photointerrupter signal will be described in detail using FIG. 14.

A rotating plate 25 is connected between the transmitting and receiving light of the transmission type photointerrupter 23.
When the phototransistor 23b rotates, a photocurrent is output from the emitter of the phototransistor 23b in accordance with the bright and dark pattern printed on it. The output current becomes the collector current of the PNP transistor 85, and a voltage is generated across the detection resistor 83.
It is applied to the comparator 88. On the other hand, a constant voltage (Vcf) is applied to the single voltage of the comparator 88.

By this comparator 88, the photointerrupter 23
The output signal of is converted into a feeding pulse, but if the threshold voltage (Vcf) is set to the intermediate level of the voltage width (VP-pH, VP-PL) of the output signal, the period between the high level and low level (duty) becomes almost constant (Fig. 15). This setting is performed by adjusting the digital current to the DA converter 94 by the current setting circuit 95 in the variable constant current circuit 24, that is, by adjusting the light emitting current of the photointerrupter 23. This allows the dot spacing to be constant. Imprint data is obtained (Fig. 17).

The output pulse of the comparator 88 is input to the one-shot pulse generating section 27a, and a signal inverted by the inverter 89 is input to the one-shot pulse generating section 27b. As a result, the output of the AND gate 90 becomes the output of the comparator 8.
A one-shot pulse is output at the timing of the rising and falling edges of 8.

Note that the pulse width of this one-shot pulse is variable depending on the film sensitivity signal inputted from the camera control circuit 16.

On the other hand, as shown in FIG. 16, when the light emitting current of the photoinverter 23 set by the variable constant current circuit 24 consisting of the resistor 91 and the current setting circuit 95 is small, the duty of the output pulse of the comparator 88 is It deviates from 50%. This results in imprint data with uneven dot spacing as shown in FIG.

FIG. 24 is a circuit diagram showing the main part configuration in another embodiment of the present invention, and this corresponds to FIG. 14 in the aforementioned embodiment.

In the above embodiment, the current flowing through the photointerrupter 23 was made variable as a duty adjustment mechanism, but this current is made constant and the threshold voltage (Vcf) is made variable to obtain the same effect. In other words,
In order to adjust the power (voltage (Vcf)) of the comparator 88 with the variable resistor 101 to generate a waveform as shown in Fig. 15, and to obtain data with appropriate dot spacing as shown in Fig. 17. It is something to do.

According to this embodiment, an imprint timing signal is created using the rising and falling edges of the output pulse of the photointerrupter 23, and dot imprinting is performed. ,
It becomes possible to imprint data with constant dot spacing without using a special detection device.

Further, the circuit scale does not become large unlike when a doubler circuit is used, and the influence of rapid fluctuations in film feeding speed is eliminated.

(Correspondence between the invention and the embodiment) In this embodiment, the photointerrupter 23 is used as the pulse signal generating means of the present invention, and the LED driver 39 and the dot
The LEDs 40 to 48 serve as imprinting means, and the photointerrupter detection circuit 26. One shot circuit 27. The resistor 91 to the current setting circuit 95 corresponds to timing signal generation means, and the microcomputer 1 corresponds to imprint control means. Further, the current setting circuit 95 or the variable resistor 101 in the variable constant current circuit 24 corresponds to duty adjustment means.

(Effects of the Invention) As explained above, according to the present invention, the timing signal generator detects the rising and falling edges of the pulse from the pulse signal generating means and generates the imprint timing signal in synchronization with each edge. and an imprinting control means for driving the imprinting means to perform imprinting based on the imprinting timing signal from the timing signal generating means, thereby controlling the pulses generated in response to film feeding. By detecting edges not only in one direction but also in both directions and imprinting dots in synchronization with this, the camera can be made more compact, and even if the film speed fluctuates, the correct data can be recorded. You can imprint.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a perspective view showing how data is imprinted on film in a dot matrix using the apparatus of this embodiment, and Fig. 3 is a diagram of the apparatus of this embodiment. Figure 4 is a timing chart during imprinting in this embodiment, and Figure 5 (A) also explains the output order of fonts. Figure 5 (B
) is a diagram showing a photograph with data such as characters imprinted, Figure 6 is a diagram explaining the case of shifting font data, and Figure 7 is a (7X5) from a (9x7) font. Figure 8 is the same (Figure 8 is a diagram showing the description state of the font data table in the ROM, Figure 9 and Figures 11 to 13 are diagrams showing the operation in one embodiment of the present invention). 10th flowchart showing
14 is a circuit diagram showing details of the photointerrupter circuit, one-shot circuit, and variable constant current circuit shown in FIG. 1. 16 and 16 are timing charts when the threshold voltage is appropriate and inappropriate for the photointerrupter signal in the circuit shown in FIG. Figure 19 shows the input/output board of the microcomputer shown in Figure 1 and its contents. Figures 20 and 21 also show the data memory in the microcomputer and its contents 1.2. 22 is a diagram showing the correspondence between the font table address in the ROM and font data, FIG. 23 is a diagram showing the contents of the message counter and imprinted contents, and FIG.
The figure is a circuit diagram showing details of a photointerrupter circuit and a one-shot circuit in another embodiment of the present invention. 1... Microcomputer, 23... Photo ink converter, 24... Variable constant current circuit, 25...
... Rotating plate, 26 ... Interrupter detection circuit, 27 ... River one-shot circuit, 40 to 48 ... Dot LED 5 ... Current setting circuit, 1・・・・・・Variable resistance.

Claims (2)

[Claims] (1) A data imprinting device for a camera comprising a pulse signal generating means that generates a pulse signal in response to film feeding, and an imprinting means that imprints data in the form of dots onto the surface of the film being fed, timing signal generating means for detecting the rising and falling edges of the pulse from the pulse signal generating means and generating an imprinting timing signal in synchronization with each edge; and based on the imprinting timing signal from the timing signal generating means. A data imprinting device for a camera, comprising: imprinting control means for driving said imprinting means to perform imprinting. (2) The camera according to claim 1, wherein the timing signal generating means includes a duty adjusting means for adjusting the duty ratio of the pulse from the pulse signal generating means to approximately 1:1. Data imprinting device.