JPS61259244A - Data imprinting device - Google Patents

Abstract

PURPOSE:To make data imprinting always at proper exposure by providing an imprinting controlling device that determines the quantity of light emission of a light emitting element for data imprinting arranged in front of a shutter basing on the second (time) information of the shutter. CONSTITUTION:In a device for imprinting scientific data etc. in a film, a shutter 14 in which the front curtain and the rear curtain of a shutter run while keeping a slit width corresponding to the shutter time is provided in front of a film 6. A transmission type liquid crystal 11 for data imprinting, an LED 12 as a light emitting element and an image forming lens 13 are provided in the front of the shutter 14. A luminance controlling signal is sent to the luminance controlling circuit 100 of the LED 12 from the group of data switches 70 calculating from film sensitivity information stored beforehand in a CPU 50 and the luminance of a subject from a photometric circuit 60, and controlling signals are sent to a shutter controlling circuit 82 and a diaphragm controlling circuit 90. By such constitution, the imprinting of data can be made at proper exposure at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data imprinting device for imprinting date data, academic data, etc. onto film.

(Prior Art) A data imprinting device is conventionally known that is built into the back cover of a camera and imprints data from the back side of the film. In this method, data is imprinted through the anti-reflection coating (backing layer) on the back of the film, but the disadvantage is that the ratio of surface sensitivity to back sensitivity differs depending on the type of film, so the imprint density differs depending on the type of film. There is.

Therefore, as an improved method of the conventional method, a device has been proposed in which data is imprinted from the emulsion side on the front side of the film.

However, with this method, like a single-lens reflex camera,
If the shutter is placed just in front of the film,
Since the image must be imprinted through the shutter, there is a drawback that the imprint density varies depending on the shutter speed.

(Object of the Invention) The present invention has been made to solve the above-mentioned conventional problems.In a device that imprints from the front of the film through a shutter, it is possible to imprint data with an appropriate exposure amount. The purpose of the present invention is to provide a data imprinting device with the following functions.

In order to achieve the above object, the present invention provides an imprinting control means for determining the amount of light emitted from a light emitting element for imprinting based on shutter time information in a device that imprints from the front side of a film through a shutter. It is characterized by a data imprinting device configured with the following.

(Example) Figure 1 shows the main configuration of a camera as an example. 1 is the first group lens configuration, 2 is the second group lens configuration, and 3 is the third group lens configuration. Each lens structure as a system constitutes a 1 to 3 zoom system. 4 is the fourth group lens configuration, 5-diaphragm diaphragm, 6 is film, and 7 is a half mirror whose entire surface is a semi-transparent mirror, tilted at approximately 45° with respect to the optical axis ff5I/c of the subject as shown in the figure. The light flux from the subject can be guided in the direction of the film 6, and can also be guided to a finder optical system, which will be described later.

Reference numerals 8 to 10 constitute a finder optical system, including an 8-digit focusing plate, 9 a pentagonal roof prism, and 10 an eyepiece lens.

Reference numeral 11 denotes a transmissive liquid crystal for imprinting data, and although detailed illustration is omitted, it has a known segment configuration (numerals, alphabets, etc.) for imprinting data. 12
1. As a light emitting element for imprinting. The HD 13 is an imaging lens for imprinting, and is set so that the imprint data of the liquid crystal 11 is imaged on the focusing plate 8 and film 6. Reference numeral 14 denotes a shutter. Although detailed illustrations are omitted, the well-known shutter front curtain and rear curtain are composed of a plurality of blades, and in response to the shirt release, the shutter front curtain first runs to open the shutter. After the set shutter time, the shutter trailing curtain runs and closes the shutter.

In the optical system shown in FIG. 1, the film 6 and the shutter 14 are placed apart, but by arranging the fourth group lens structure between the shutter 14 and the film 6, the film 6 and the shutter 14 can be separated. The focus plate 8 is set in a conjugate relationship.

In addition, in this optical system, the half mirror 7 is fixed and the light beam for data imprinting is directed toward the half mirror 7, so a part of this light beam is reflected by the half mirror 7 and reaches the edge of the film 6. The other luminous flux is)s
7 It passes through the mirror 7 and enters the finder optical system 8 to 10, making it possible to check the imprint data and the fact of imprinting within the finder. In the configuration of this embodiment, the image is formed by the transmission type liquid crystal 11. Since the imprint data is imprinted onto the film 6 through the shutter 14, it is necessary to synchronize the imprinting when the shutter 14 is open. The shutter 14 according to this embodiment has the same structure as a so-called normal focal plane shutter, in which the leading and trailing shutter curtains run while maintaining a predetermined slit width depending on the shutter speed.

FIG. 2 shows the state of passage of the shutter base and the state of transmission of the imprinting light beam at an arbitrary position A point of the shutter opening of the shutter 14. In the figure, the horizontal axis indicates time;
tl is the start of the shutter front curtain running and the start of light emission of the LED 12 for data imprinting, t2 the front curtain passes point A, t
3 to t3'', the rear curtain passes point A, t4 to tz, the trailing curtain has completed traveling, and t, to i, and l, the LED 12 stops emitting light.

On the other hand, the vertical axis indicates the intensity of the imprinting light flux passing through point A, that is, the luminance value of the LED 12.

In this embodiment, an LE is used as a light emitting element for data imprinting.
As control of D12, a method is used in which the light emission brightness is changed when the shutter speed is faster than a certain value, and the light emission time is changed when the shutter speed is slower than the value. Therefore, an overview of the above-mentioned control will be explained with reference to FIGS. 2(a) to 2(C). It is assumed that the shutter/second time in FIG. 2(a) is relatively high. At tl, the shutter front curtain starts running due to the front curtain running start signal.
In conjunction with this signal, the LED 12 simultaneously starts emitting light.

Since the leading curtain passes point A at time t2 with a delay time corresponding to the speed of the leading curtain, the light flux of the LED 12 passing through point A begins to reach the film point t2. Next, after a predetermined shutter time has elapsed, the shutter trailing curtain passes point A at t3 and the imprinting light flux is blocked, and then at t4 the trailing curtain completes its travel with a delay time corresponding to the trailing curtain speed. The LED lights up in synchronization with the travel completion signal emitted by the switch linked to the
The light emission of 12 is stopped. Note that due to the light emission characteristics of the LHD 12, there is a delay in both the rise and fall of light emission as shown in the figure.

Regarding data imprinting, Apex calculation formula % formula % (1
) holds true, so the shutter speed TV1 confluence lens 13
L as a light emitting element from the opening of AV% film sensitivity SV
The brightness Bv of ED12 is Bv = AV + TV -8V...
・・・・・・・・・・・・・・・Since it is determined from (2), L
It is sufficient if the ED 12 emits light at a brightness corresponding to this. Hereinafter, AV, 'rv, BV, and Sv in this specification each represent a numerical value that has been converted to fit in the apex calculation formula.

FIG. 2(b) shows a case where the shutter speed is lower than that in FIG. 2(a). Front curtain running start and light emission start t1, front curtain passing hIf1 Same as above, but trailing curtain passing is 13/, trailing curtain running light is 1. /, light emission stops at t5', t4I, t,I. The brightness of ID12 at this time can also be found from equation (2).

By doing the above, a constant amount of exposure is always given to the film 6, but if the shutter time is extremely long, the brightness of the LFID 12 becomes extremely low, making it impossible to confirm the image in the viewfinder. It becomes. Therefore, when the brightness Bv is less than a certain value 13vo, the brightness of LED12 is set to 13vo, and the imprinting time, that is, LED1
The above-mentioned disadvantages can be removed by shortening the light emission time in step 2. Then, the luminescence time TV' at this time is Ty from equation (1).
' = BVO+ SV -AV ・・・・・・・・・
・・・・・・・・・・・・It is found by (3). This situation is shown in FIG. 2(C). tl.

t2 is the same as in Figure 2 ca>, cb), but the light emission stop timing t5'' is independent of the trailing curtain run completion signal (3)
It is determined by the light emission time Tv' value obtained by the formula, and the trailing curtain passes point A at t3'' after the light emission stops, and travel is completed at t4''. Strictly speaking, the time t5 corresponds to the light emission time T
On the other hand, the actual exposure time of the film 6 is the time shown in the shaded area, so there will be an error between the two, but the light emission time TV' can be adjusted by adjusting the shutter curtain travel. This error can be almost ignored if the time is set to a sufficiently long time compared to the required time.

These imprinting sequences and circuits are shown in FIGS. 3 to 5.

In FIGS. 4 and 5, there are 50 CPUs.

Reference numeral 52 denotes a photometry switch that is turned on when the release button is operated in the first step, 54 is a release switch that is turned on when the release button is operated in the second step, and 60 is a photometering circuit that measures the brightness of the subject in response to the photometering switch 52. , 70 is a group of various data input switches υ, film sensitivity information, correction of imprint date, shutter speed during manual mode, aperture υ value, etc.
It can be input to PU50. Reference numeral 80 denotes a shutter control configuration including a shutter drive circuit 82, a front curtain running light switch 84 that operates when the shutter leading curtain has completed running, and a trailing curtain running light switch 8 that operates when the shutter trailing curtain has completed running.
Contains 6. Here, the shutter drive circuit 82,
The front and rear shutter curtains (not shown) are operated according to the program calculated by the CPU 50 based on the subject information from the photometry cycle @60 or the shutter time set in Mania/l/. The switches 84 and 86 operate in conjunction with the operation of the front and rear curtains of the shutter near the time of completion of travel, and this output information is input to the CPU 50. Reference numeral 90 denotes an aperture control circuit, which controls an aperture value (not shown) to an aperture value set manually or by a program calculated by the CPU 50. 96 is a liquid crystal drive circuit for driving the transmissive liquid crystal 11;
In response to signals such as date information from the CPU 50, each segment of numbers or alphabets on the transmissive liquid crystal 11 is operated. Reference numeral 100 denotes an LED 1' that illuminates the transmissive liquid crystal 11 for imprinting data onto the film 6.
This is a brightness control circuit that controls the light emission brightness of No. 2. This circuit 100 includes film sensitivity information V'B from CPtJ50.
v and shutter time information vTV are input as voltage information. In the circuit 100, 110 are known amplifier circuits, 116, 118, 120. Gate 160 is an OR gate. This brightness control circuit 100 amplifies film sensitivity information V1'lV and shutter time information vTV input from the CPU 50 in an amplifier circuit 110, and passes the film sensitivity information V1'lV and shutter time information vTV input from the CPU 50 to each comparator 122, 124, 126 via each bleeder resistor 116, 118, 120, 121. .128, and by comparing it with the constant voltage 114, the comparators 122 to 128
output is selected.

On the other hand, the slip-flops 132 to 138 are connected to the oscillator 130.
After receiving the basic single pulse signal from
output as output, directly or AND gate 140.
142 and 144, an abnormal duty pulse signal is output to the computer games 150, 152, 154, and 156. The outputs of the comparators 122 to 128 are supplied to other input terminals of the AND gates 150 to 156,
Opening and closing of AND gates 150 to 156 can be controlled by the outputs of comparators 122 to 128. The outputs of the AND gates 150 to 156 selected by the outputs of the comparators 122 to 128 are supplied to the base of the transistor 202 via the OR gate 160, and the high pulse signals output from the AND gates 150 to 156 are The LED 12 is enabled to emit light only when the output is output. In addition,
This brightness control circuit 100 opens an AND gate 150 when the shutter speed set by the CPU 50 is a long time, supplies a low-order pulse signal with a small duty to the transistor 202, and As the time becomes shorter, the AND gates 152→154→156 are opened to supply a high-order pulse signal with a large duty to the transistor 202. Similarly, regarding the film sensitivity value set by the data input switch group 70, when a high-sensitivity film is loaded in the camera, the AND gate 150 that outputs a low-order pulse signal opens; As the film sensitivity decreases, the AND gate 15
The configuration is such that 2→154→156 is selected. Shikatsu "c", LED can emit light at a brightness of 12ti'[[(4fi in the embodiment).

On the other hand, 203, 204, and 206 are transistors,
1. is forced to the base of the transistor 2030 by the HcPU50. A signal for turning off the ED 12 is supplied, and this signal normally remains high. Also, transistor 2
04 is supplied with a shutter open signal from the CPU 50, that is, a shutter front curtain running start signal, and the transistor 204 is turned on at the same time as the shutter is opened. Further, the output signal of the trailing curtain running optical switch 86 is supplied to the base of the transistor 206, and when the shutter trailing curtain completes running and the shutter is closed, the transistor 206 turns from ON to OFF.

That is, the LED 12 for emitting imprint data light onto the film surface is turned on when the shirt lid is open and turned off when the shirt lid is closed.

Next, the circuit operation will be explained based on the flowchart of FIG.

The photometry switch 52 is set to 0N by operating the first stage of the release button.
L (step 30), the photometry circuit 60 performs photometry of the subject brightness (step 31). Then, the film sensitivity information input in advance through the data input switch group 70 is determined by the CPU 50 (step 32), and the CPU 5
0, the shutter speed and aperture value are calculated based on the subject brightness and film sensitivity information (steps 33 and 34).
. Next, when the release button is operated to the second stage, the release switch 54 is turned ON and the aperture is closed by the aperture control circuit 90 (step 36), and then the shutter drive circuit 82 causes the shutter front curtain to start running (step 37). )
After the calculated shutter seconds, the shutter trailing curtain starts running (step 38), and the trailing curtain travel light switch 86 linked to the shutter trailing curtain generates a travel completion signal (step 39), and the - frame operation is performed. finish.

On the other hand, film sensitivity information (step 32), aperture AV information of the imaging lens 13 of the imprint optical system (step 40)
Based on the calculated shutter time information (step 33), the brightness control circuit 100 calculates the brightness BV of the LED 12. It is assumed that the aperture Av information of the imaging lens 13 is incorporated in advance into the shutter speed information vTV and the mechanism film sensitivity information V8V by the CPU 50. Then, the preset visibility limit brightness E3vo is compared with the brightness BV of the LBD 12 (step 44).
, when BV≧BVo, the brightness of the LED 12 only needs to be selected from among the four types of brightness that have been set, so the LED 12 starts emitting light in synchronization with the start of running of the shutter front curtain depending on the selected brightness.Step 45 ), the light emission is stopped in synchronization with the completion of travel of the shutter trailing curtain (step 46).

On the other hand, when BV < 13vo, the brightness of the LED 12 is set to Bvo (for example, the minimum brightness value formed by the brightness control circuit 100), and light emission is started in synchronization with the start of the shutter front curtain run, and the light emission time Tv at this time is ``CPU
At 50, TV' = 13vo + SV - Av
(Step 48), and after the TV' time has elapsed, the transistor 203 is forcibly turned off to end the light emission (Step 49).

Note that when the subject has high brightness and the shutter speed becomes fast, the brightness of the LFiD 12 must be increased accordingly, but there is a limit to high brightness light emission with ordinary LED elements.

Next, a case will be described in which the brightness of the LED 12 cannot follow the settable high-speed shutter speed, including the program diagram in FIG. 6.

In the above case, the CPU 50 changes the combination of the shutter speed and aperture of the camera to increase the shutter speed and narrow the aperture. Specifically, in the program diagram of FIG. 6, the solid line P1 is the program diagram for normal imaging without data imprinting.

Here, assuming that when the film sensitivity is 15O100 and the shutter speed is 1/250, the maximum luminance of LPXD12 is the limit, when the subject is brighter than EV13, the exposure amount for data imprinting will be insufficient. Therefore, in such a case, by changing the program diagram to the one-dot chain line P2, an appropriate exposure amount including data copying 7 can be given with EV17t.

In addition, the dashed-dotted line P3 shows the correction when the film sensitivity is l5O50, and the dashed-dotted line P4 shows the correction when the film sensitivity is l80.
200 is shown.

The characteristic feature of the embodiments described above is that data is imprinted on the front surface of the film through the shutter, so data can be imprinted at an appropriate density regardless of the type of film, and unlike conventional methods. The problem of imprinting from the back side of the film can be solved.

In addition, in this embodiment, the luminance of the data imprinting light emitting element is changed according to the shutter speed [-< By changing the emitting time, the problem in imprinting data through the shutter is solved. .

In addition, in this embodiment, when the shutter speed is high and the luminance of the data imprinting light emitting element exceeds the limit, the shutter speed is shifted to the low speed side and the aperture is further narrowed down. I was able to shift the data to the correct exposure and always be able to imprint data.

Furthermore, in this embodiment, the data imprinting light is transmitted not only in the direction of the film surface 6 but also in the direction of the film surface by the half mirror 7.
Since it was also projected onto the focus plate 8, the data imprinted contents and confirmation of the imprinting could be seen in the viewfinder.

(Effects of the Invention) As explained above, the present invention solves the problem of the conventional device that imprints υ data on the back side of the film, and makes it possible to always perform proper data imprint exposure regardless of the type of film. It is possible to provide a data imprinting device that can imprint data.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main components of a camera showing an embodiment of the present invention. FIG. 2 is an explanatory diagram showing control of the amount of imprinting light in the embodiment. FIG. 3 is a flowchart showing the data imprinting operation of the embodiment. FIG. 4 is a block diagram of a data imprinting circuit according to an embodiment. FIG. 5 is a detailed circuit diagram of the main part of FIG. 4. FIG. 6 is a program diagram of the embodiment. 6...Film, 11...Transmissive liquid crystal for data imprinting, 12...LED as a light emitting element for imprinting
, 14--Shutter, 50-CPU. 80... Shutter control configuration, 100... Brightness control circuit. Figure 4 7n

Claims (4)

[Claims] (1) In a device that imprints data onto a film surface through a shutter using a data imprinting light emitting element placed in front of the shutter, the amount of light emitted by the light emitting element is determined based on shutter time information. A data imprinting device comprising a control means. (2) The data imprinting device according to claim 1, wherein the imprinting control means controls the light emission brightness or light emission time of the light emitting element. (3) In the data imprinting device as described in claim 1, the imprinting control means synchronizes the start of light emission of the light emitting element with the movement of the shutter front curtain, and synchronizes the stop of emission with the movement of the shutter rear curtain. . (4) In a device that imprints data onto a film surface through a shutter using a light-emitting element for data imprinting placed in front of the shutter, the amount of light emitted by the light-emitting element is determined based on shutter time information. A control means, and an exposure control means for changing the shutter time to a predetermined long time and narrowing the aperture aperture to a predetermined value when the set shutter time is shorter than a predetermined value. A data imprinting device featuring: