JPS58105133A - Display of camera - Google Patents

Abstract

PURPOSE:To confirm operation visually and to perform efficently self-timer operation display by swithcing a self-timer operation display element from a sounding body to a light emitting body through the switching of analog switches when a lens focusing ring set position is detected electrically and the obtained value exceeds its limit value. CONSTITUTION:When a release button is pressed to the 2nd stroke in a selftimer operation state and a sound from a sounding body 8 can be heard at an object position to be photographed, the sounding body 8 is used and if the sound can not be heard through audibility correcting circuits A-B 34, 35 when the level of ambient noises increases, the display elements of a self-timer is switched to light emitting diodes 9a and 9b; a photographer knows that ambient noises are too large by red display, that the distance between the camera and subject is too long by green flashing, and the both by yellow flashing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera display device that uses a sounding body to display the operation of a self-timer and switches to a display using a light emitting element depending on the distance to a subject.

Various types of cameras are already known that use a sounding body to indicate the operation of the camera's self-timer and notify the user with a sound that the self-timer is operating, but in all cases, the volume emitted from the sounding body is constant. As the distance between the camera and the close-up object (user) increases, it tends to become difficult to hear the sound from the sounding object. In addition, if you take this into account and set the volume of the sounding device to a dog, there is a risk that it will not only disturb others around the camera, but also cause the user to attract attention from the surroundings, making it difficult to take natural photos. Problems also arise.

Therefore, as a countermeasure to the above-mentioned problem, a proposal has been made to make it possible to change the volume from the sounding body with a switch, but this is an incomplete countermeasure considering the possibility of forgetting to change the switch.

Therefore, the present applicant previously proposed a self-timer device for a camera in which the sound volume of the sounding body is changed according to the set position of the lens distance ring, in U.S. Pat. No. 6-122186 and E-. It is designed to take measures against distance.

However, even with such a proposal, it is impossible to control the volume of the sounding element without limit in response to the subject distance due to the power supply voltage of the circuit, the voltage resistance capacity of the circuit elements, the dynamic range of the sounding element, etc. It is. As an extreme example, if the subject is at an infinite distance from the camera and you set the lens distance ring at that position, in order to hear the sound of the self-timer's operation display at that distance, you need to move the distance from the sounding element to infinity. The sound must be emitted7, but it goes without saying that this is impossible.The present invention was made in view of the above-mentioned circumstances, and the volume of the sounding body is adjusted to the position set by the distance ring of the photographic lens. j, 6 to control 7
, the object is to provide a camera display device in which when the distance ring setting position exceeds a certain limit value, the sounding body stops producing sound7 and the self-timer operation display using the light emitting element starts. .

An embodiment of the present invention will be described in detail below with reference to the drawings.

Photographing lens, 3 is the upper lid of the camera body, 4 is the accessory shoe located on the upper lid 3'', 5il-1 is the winding lever, 6 is the self-timer set and shutter button lock lever on the same lever. By matching the instruction with the fixed index on the top ☆ 3, A, or S, the camera can be switched to shutter button lock, normal shooting mode, and self-timer shooting preparation mode using the switching mechanism located inside the camera. . 7 is a shutter button, and 8 is a sounding body for self-timer display, which is attached closely to the main body 1.

2(a), 2(b), and 2(c) show the positional relationship between the fixed indicators A and S shown in FIG. 1 and the self-timer set lever 6. 1 is a display light emitting diode, and this light emitting diode 9 is in a display state when the self-timer is used, but is hidden behind the lever 6 in the state shown in FIG. Then, as shown in FIG. 2(a), when the indicator 6c on the self-timer set lever 6 coaxially connected to the shutter button 7 is aligned with the fixed index L on the top cover, a switching mechanism (not shown) is activated. It becomes impossible to press down the shutter button 7, and the shutter button is locked. In this case, as shown in the figure, the light emitting diode 9 is shielded by the tip 6a of the self-timer set lever 6 and cannot be recognized from the outside. Next, Figure 2(b)
When the instruction 6c of the self-timer set lever 6 is set to the fixed index A as shown in FIG. If the shutter button 7 is pushed down four degrees, a power switch (not shown) is closed, and if the shutter button 7 is pushed down further, the switch is closed and normal photography is performed. In this case as well, the light emitting diode 9 is shielded by the tip of the self-timer set lever 6 and cannot be seen from the outside. Then, as shown in Figure 21(c), press the self-timer set lever.
When the instruction 6c of 6 is aligned with the fixed index S, the self-setting switch 12 shown in FIG. 3 is closed. In this case, the light emitting diode 9 is connected to the tip 6a of the self-timer set lever 6.
Since the light is no longer shielded by the VC, the subject or the photographer can perceive the light caused by this.

When the shutter button 7 is pressed down in this state, the power switch is turned on, and when the shutter button 7 is pressed down further, the self-activation switch shown in Fig. 3≠≠≠11
is on and the sounding element 8 normally emits an intermittent sound to indicate that the camera is in self-timer shooting mode, and when the surrounding noise is large or the distance between the camera and the subject is large. The sound from the sounding element 8 stops, the light emitting diode 9 blinks at the same frequency as the intermittent sound from the sounding element, indicating that the camera is in self-timer shooting mode, and after a certain period of time the shooting operation starts automatically. It is carried out according to

Here, FIG. 3 shows a self-timer circuit of the camera shown in FIG. 1, and in FIG. 3, 8 and 9 are the light emitting diodes of the sounding body 9 shown in FIG. 1, respectively.

10 is an oscillator that generates a fundamental frequency and a clock pulse of [7 to 8,192 KH7, this oscillator] 0 is a clock pulse that is connected to a switch 1.1. ．． 12 to the clock input terminal 13a of the counter 13. Excavation 510 is inverter 10. , 102, resistance 10. , 10. and capacitor 10. It is composed of. 11 is a self-operating switch, and this switch 11 is the second one of the shutter button 7.
Closes in conjunction with the stroke. 12 is self-installation'')V
This switch 12 is closed by setting the self-timer seso register 6'K to the position of index A. 13 (ri counter, clock input terminal 1.3
The clock pulse manually inputted to a is frequency-divided, and the frequency-divided pulse v4 is outputted from each Q terminal. Q, 1 from the terminal
．． 024KtlZ, Q4 terminal to C 512 llZ
, The Q+3 terminal outputs a pulse with a fundamental frequency of 111Z -, and the Q+a terminal outputs a pulse with a fundamental frequency of 1/811z.○
A high level (
Hereafter, it will be referred to as H level. ) is input, the frequency dividing operation stops and each Q terminal is all at a low level (hereinafter referred to as L level).
becomes. 14 is Nantes Gate 14. , 142 are connected to the reset terminal of frame 13. 15 is an inverter, and 16 is a switch which is closed in conjunction with the winding of the winding lever 5 shown in FIG. An inverter 18 inverts the output of the Q+6 terminal of the counter 13 and inputs it to the RS flip-flop 14. 19 is an AND gate, 20 is a resistor, and 21 is an amplifier which inputs the voltage at the connection point between the resistor 20 and a transistor 65, which will be described later, and amplifies it enough to drive the vinegar generator 8. 22 is an analog switch, and when 22c becomes H level, 22a, 2
2b is in a short-circuited and conductive state. (Regarding the analog switch, ":" is the same below, and when C becomes H level, conduction occurs between a and b.) 23 is an analog switch, and the sounding body 8 is composed of a piezoelectric buzzer, an electromagnetic speaker, etc., and also operates as a microphone.

25 is an analog switch, 26 is an impark, and 27 is an amplifier that amplifies the collected sound signal when the sounding body 8 operates as a microphone. 28 is 512 stages of B B D (Bu
cket Brigade Device), the analog signal from the amplifier 27 is inputted to 28c and 28a,
It is delayed in synchronization with the two-phase clocks of mutually opposite phases inputted to 28bK and outputted from the 28d terminal.

29 is an inverter, 30 is an OP amplifier, 31.32°3
3 is resistance. 34 is a hearing correction circuit having a custom-made A curve as shown in FIG. Reference numeral 35 denotes a hearing correction circuit having characteristics of the B curve shown in FIG. 36 is the hearing correction circuit shown in C in Figure 6.
It has the characteristics of a curve. 37, 38, and 39 are analog switches; O40 is a diode; 41 is a resistor; and 42 is a capacitor; these three constitute an average value detection circuit. 4
3 is a resistor, 44 is an OP amplifier which is connected as a follower and is used as a buffer amplifier. O45 is a constant voltage circuit, which will be described later. A constant voltage is supplied to the resistor 66. 46 to 48 are resistors forming a voltage dividing circuit for the voltage of the constant voltage circuit 45. 49 and 50 id comparators compare the voltage of the OP amplifier 44 with the voltages at the connection points of resistors 46 and 47 and 47 and 48, respectively. 51 is an AND gate, 52 is a NOAH gate, and 53 is a NOAH gate. Reference numeral 54 denotes an information resistor that is linked to a distance ring provided on the outer periphery of the lens 2, and the voltage at the variable terminal 54a changes continuously from close range to infinity. The voltage increases as it approaches the closest side. 55 is an OP amplifier connected to a follower and operates as a buffer amplifier.

5G is an op amp, 57.58 is a resistor and OP amp 56
At the same time, the output of the OP amplifier 55 is inverted. Reference numeral 59 is an OP amplifier, and 60 to 63 are resistors, which calculate the outputs of the OP amplifier 44 and the OP amplifier 56. 64 is a resistor, 65 is a transistor, and the output of the AND gate 19 is voltage-divided by the impedance between the resistor 20 and the collector and emitter of the transistor 65. 66 and 67 are resistors that divide the voltage of the constant voltage circuit 45. 68 to 70 are comparators, 71.72 is an inverter, 73 is an AND gate, 74.75 is an OR gate, 76fl is an analog switch, 77 is an inverter, 78.79 is an AND gate, light emitting diode 9 is two light emitting diodes 9+, 92 is a variable color, 91 is a green light emitting diode, 92 is a red light emitting diode, 9a, 9b
, 9c ld 3 terminals of light emitting diode, 9a, 9
b is an anode, and 9c is a cathode.

Next, the operation of the above structure will be explained with reference to FIG. 8. By setting the self-timer setting lever 6 as shown in FIG. 2(C), the self-acid switch 12 is closed. Then, by raising the winding lever 5, the switch 16 is closed. Then, when the shutter button 6 is pressed rC, a power switch (not shown) is turned on, and the power source is turned on.
h gives 1 supply officer to Tanibe.

Then, by further pressing the shutter button 6, the self-activation switch 11 is turned on, and the pulse of the fundamental frequency 8.192K) IZ of the brother oscillator 10 is applied to the clock input terminal 13a of the counter 13. Since the switch 16 is on in the winding photon state, the connection point between the switch 16 and the resistor 17 is at L level, that is, the RS flip-flop 14
Nosu/Dogate 14. Since one end of the input is at L level, its output is at H level. Also Nantes Gate 14
2, the output of the Nant gate 14I is at ■(level), the output of inverter 15 is at H level, and the output of inverter 18 is at H level (Q+a terminal of counter 13 is at L-+H level).
Start the previous work that changes to the level. Therefore, the AND gate 19 outputs the product waveform of the Qs + QCs terminals, that is, 1.024 KHz for 1/2 second (approximately I KHz
), and the L level is output alternately for the next 1/2 second (the timing is the same as the voltage waveform shown in FIG. 8). Then, when the Q+a terminal changes to L - + H level, that is, 8 seconds after the counter 13 starts counting, the inverter 18 becomes L level, so the Nant gate 14. of the RS flip 70 knob 14. output and the reset terminal of the counter 13]: (b changes to H level and the counter 13 stops timing. Therefore, a self-timer is performed for these 8 seconds, and the operation display shows whether the sounding element 8 sounds as described later. , or the light emitting diode is blinked.The annual sales ρ shutter control circuit operates triggered by the L→H level change of the Q+e terminal of the switch counter 13, and the shutter front curtain (not shown) starts running.Now, Next, counter 1
The operation during the 8 seconds of self-timer after No. 3 starts counting will be explained. As mentioned above, during the period Q when the Q+s terminal of the counter 3 is at H level, the fundamental frequency IKHz pulse of the terminal is intermittent from the AND gate 19, passes through the resistor 20,
The signal is inputted to the amplifier 21, after being appropriately amplified by the 0-amplifier 21 (see Figure 8), and then inputted to the 22a terminal of the analog switch 22. By the way, 22c of analog switch 22
Since the terminal is connected to the Q+s terminal of the counter 13, 1. During the period when the KHz pulse is intermittent, the analog switches 22a and 22T) are electrically connected, so that the output of the amplifier 21 appears as -1: at the terminal 22b of the analog switch 22. The output is applied to the 23a terminal of the analog switch 23, but whether or not it is applied to the sounding element 8 is determined by the level of the 23c terminal. The 23c terminal is connected to the inverter 77, and the input of the inverter 77 is connected to the output of the comparator 68.
The level of the comparator 68 determines whether or not there is conduction between the terminals b. The output level of the comparator 68 will be described later.

Therefore, when 23c of the analog switch 23 is at H level, the output voltage of the amplifier 21 is fully applied to the sounding element 8, and 1/2
Intermittent pulses of fundamental frequency II (Hz) will be emitted at intervals of seconds during the self-timer operation for 8 seconds.Next, the sounding body 8 will be emitted during the period other than the 1/2 second period in which the sound is produced, that is, the remaining 1 /2 seconds, it operates as a microphone. That is, the 22c terminal of the analog switch 22 and the analog switch 25
Since signals of opposite phases are input to the 25c terminal by the inverter 26, when the analog switch 23 is conductive, it operates as a microphone during the period when there is no sound from the sounding element 8. The signal from the sounding body 8 (signal corresponding to the noise around the camera) passes through the analog switch 25 (conducting between 25a and 25b) and is input to the amplifier 27.Then, the amplifier 27 outputs the signal from the sounding body 8. The voltage corresponding to the noise around the camera is appropriately amplified and output. For the analog signal waveform, refer to the voltage waveform in Figure 8 @. The output of the amplifier 27 is applied to the BBD 28 and the resistor 31. Pulses with a basic frequency of 512 Hz, which are in opposite phases to each other, are input by the inverter 29 to the terminals 28a and 28b of the 0BB028. As is well known, tD-Ti is the two-signal delay time, fcp: clock frequency, N:
Since the number of transfer stages is N=512, the signal delay time tD of the BBD 28 is 1/2 second. The voltage waveform @ is delayed by 1/2 second so that this is shown by the voltage waveform θ in FIG. Next, the signals at the 0 point and 6 point are added and inverted using the resistors 31 to 33 and the OP amplifier 30, resulting in the signal O in FIG. This voltage waveform is shown as a composite waveform of 0 and 0 in FIG.

However, the voltage waveform shown in FIG. 8O is obtained by inverting its phase. As can be seen from this waveform, unlike the voltage waveform at point (b), a continuous waveform is obtained, and the degree of freedom in signal processing has been greatly expanded since then. Next, the signal at point (→) is from the hearing correction circuit 3a, the hearing correction circuit A34.
Hearing aid IF circuit with curve B35. The signal is input to a hearing correction circuit C36 having a C curve. The frequency characteristics of each hearing correction circuit are as shown in FIG. By passing the sound through the auditory sensation correction circuits 34 to 36, it is possible to measure the magnitude of the noise surrounding the camera collected by the sounding body 8 with characteristics similar to that of the auditory sense. Accordingly, one of the three types of curves A, B, and C is selected using analog switches 37 to 39, which will be described later.Specifically, the ambient noise is 60 dll ((MB = 0.0002μ
If the voltage is below 85 dB, use the curve B. If it is 60 to 85 dB, use the C curve. If it is 85 dB or more, use the C curve. Resistance 46~48, comparator 49°50
, ANDGATE 51. Noah Gate 52.53. The selection is made using analog switches 37-39.

Now, three types of auditory sensation correction circuits 34 to 36 having the characteristics shown in FIG. 6 will be specifically explained. Figure 4(a) and Figure 4(b) show a specific example of the @sensation correction circuit.
3 in FIG. 4(a) showing the hearing correction circuit B35.
4, 34t, 34y are capacitors, 343.34
4346 is the resistance, 34. , 348 indicates an OP amplifier that operates as a buffer amplifier. That is, Fig. 4(a)
is capacitor 34. , 34. Resistors 343 and 344 form a second-order no-pass filter, and resistors 34a,
Capacitor 34. A first-order low-pass filter is formed with the curve characteristics shown in FIG.

In addition, in FIG. 4(b), 35I is a capacitor, and 35I is a capacitor.
, is resistance, 35. is an OP that operates as a buffer amplifier.
Shows the amplifier, capacitor 35, and resistor 35! To't
' A first-order bypass filter is formed and has the characteristics of curve B in FIG. Since the C curve has a flat frequency characteristic as seen in FIG. 6, it is assumed that the input and output of the hearing correction circuit C36 are short-circuited. The signals that have passed through the auditory sensation correction circuits 34 to 36 are input to analog switches 37 to 39, respectively. These analog switches 37 to 39 will be described in detail later, but are 3
Only one of the two is chosen blindly. That is, the output signal of the OP amplifier 30 is A.

Only one of the B and C curves is audibly corrected and applied to the anode of the diode 40. Diode 40, resistor 4
1. The capacitor 42 constitutes an average value detection circuit, and the signal that has been subjected to auditory correction of the output of the OP amplifier 30 is average value detected and input to the positive phase input terminal of the OP amplifier 44 as a buffer amplifier. Here, the resistor 41 and the capacitor 42 determine the attack time from when a signal appears at the cathode of the diode 40 until the transistor 65 starts to be controlled, which will be described later. The recovery time until it runs out is determined by the capacitor 42 and resistor 43. As described above, the average value detected signal based on the appropriate attack time and recovery time is sent from the output of the OP amplifier 44 to the positive input terminal of the comparator 49.50 and the resistor 6.
1.

Therefore, the operation of the cells and comparators 49 and 50 will be explained. The output voltage of the OP amplifier 44 is determined by the constant voltage circuit 45.
Voltage division by resistors 46 to 48 and comparator 49
, 50. Then, the partial pressure level by the resistors 46 to 48 is set to OP corresponding to the noise level around the camera.
Corresponding to the output voltage of the amplifier 44, the connection point of the resistor 47°48 corresponds to a noise level of 60 dB, and the resistor 46.47
The connection point is set so that the noise level is 85 dB. Therefore, while the output voltage does not appear in the OP amplifier 44 immediately after the power is turned on, the voltage at the positive input terminal of the comparator 49.50 is zero, so the outputs of the comparator 49.50 are both at L level. Therefore, since the output of the NOR gate 52 becomes H level, the voltage at the terminal 37c of the analog switch 37 also becomes H level, and conduction occurs between 37a and 37b, that is, the signal from the hearing correction circuit A34 is applied to the anode of the diode 40, and the average value detection is performed. The voltage applied to the OP amplifier 4
Appears in the output of 4. The voltage is again compared with the voltage divided by the resistors 46 to 48 at the comparators 49 and 50, but if the noise level around the camera is below 60 dB, the outputs of the comparators 49 and 50 are always at the L level, and the auditory sense correction is performed. The A curve continues to be chosen. However, when the noise level exceeds 60 dB (but below 85 dB), comparator 49 is at L level, but comparator 50
is inverted to H level. Then, the NOR gate 52 becomes L level, the analog switch 51j becomes L level, and the NOR gate 53 becomes H level, and 38 of the analog switch 38
There is continuity between a and 38b, and the B curve is selected for auditory correction. When the noise level further increases and exceeds 85 dB, comparators 49 and 50 both become H level, and AND gate 51 becomes H level, NO G) 52.53#[
The signal becomes L level, and the C curve is selected for auditory correction. As described above, the noise level around the camera appears at the output of the OP amplifier 44 through an appropriate hearing correction circuit according to the level. That is, the output of the OP amplifier 44 appears at a voltage corresponding to the noise level perceived by the human ear.

Now, in FIG. 3, only one of the three types of hearing correction circuits 34 to 36 is selected and used using the three analog switches 37 to 39, but FIG. 5 may be cited as a method to further simplify the circuit. Figure 5 shows three types of auditory correction combined into one, 90.91 is a capacitor, 92.93 is a resistor, 94.95 is an analog switch, 96 is an OP amplifier that operates as a buffer amplifier, and 97 is a resistor. , 98 is a capacitor, 99 is an analog switch, and 10 is an OP amplifier that operates as a buffer amplifier.The operation will be explained by connecting terminals 94c, 95c of analog switches 94, 95, and 99.

When 99c is leveled, 94a, 94b and 9 respectively.
5a.

The areas between 95b and 99a and 99b are open, as shown in Figure 4 (a).
) is the same as the hearing correction circuit having the A curve.

Mata analog switch 90.99 each terminal 90c99c
is set to H level, and the input of the auditory correction circuit having the B curve of FIG. 4(b) of the analog switch 95,
This is the same as when a resistor is connected between the ground, but since the output of the OP amplifier 3° in FIG. 3 is connected to the input terminal, the impedance is sufficiently low, so the resistance can be ignored. Also, each terminal 94 of the analog switch 94, 95.99
c, 95c.

When all 99c are set to H level, all the analog switches become conductive, and the signal applied to the input passes through the OP amplifiers 96 and 100 as two buffer amplifiers and appears as it is at the output. That is, it is a hearing correction C curve.

In order to perform the above operation, the output gates from the comparators 49 and 50 in FIG.
By adding 5.99 to each of the terminals 94c, 95c, and 99c, the hearing correction circuits 34 to 36 and analog switches 37 to 39 in FIG. 3 can be replaced with only those in FIG.

A resistor 6 to which the output of the OP amplifier 44 in FIG. 3 is connected
Before explaining 1 onwards, let us explain the O input to the resistor 60.
The signal of the P amplifier 56 will be explained. First, a constant voltage from a constant voltage circuit 45 is applied to an information resistor 54 linked to a lens distance ring. The voltage at the terminal 54a of the information resistor 540 increases as the lens distance ring approaches the closest distance, and decreases as the lens distance ring approaches infinity. Therefore, that 'voltage appears as it is at the output of the OP amplifier 55, and is further inverted and amplified by the resistors 57, 58 and the OP amplifier 56.

That is, the output of the OP amplifier 56 increases as the distance approaches infinity.

Then, the output voltage of the OP amplifier 56 and the OP amplifier 44
The output voltage of resistors 60, 61, 63 and OP amplifier 59
It is calculated by Further, the resistor 62 is a resistor for level shifting. Therefore, the output voltage of the OF amplifier 59 increases as the output voltage of the OP amplifier 44 or the output voltage of the OP amplifier 56 decreases, and the base current of the transistor 65 increases via the resistor 64. , the collector-emitter impedance of the transistor 65 drops. That is, the voltage division ratio between the resistor 20 that divides the output of the AND gate 19 and the collector-emitter impedance of the transistor 65 becomes smaller, and the voltage applied to the input of the amplifier 21 becomes smaller. Further, when the analog switch 23 is electrically connected between 23a and 23b, the voltage applied to the sounding element 8 is also reduced, and the self-timer display sound emitted from the sounding element 8 is reduced. In other words, when the noise level around the camera is low and the output voltage of the OP amplifier 44 is low, and the distance between the camera subjects is small, the lens aperture ring is adjusted to the close-up direction, and the OP amplifier 56 is When the output voltage is low, the self-timer display sound emitted from the sounding element 8 becomes low. Conversely, if the noise level around the camera is high or the distance between the camera subjects is large and the lens aperture ring is set to infinity, the self-timer display sound emitted by the sounding element 8 will be It gets bigger. Moreover, even in the middle case between the two cases described above, the sound generation level of the sounding element 8 is appropriately adjusted according to the noise level around the camera and the setting position of the camera lens distance ring.

That is, the sound emitted from the sounding body 8 during the self-timer operation is always moderate depending on the surrounding noise and the distance to the camera at the subject position. The discussion above has been based on the assumption that 23c of the analog switch 23 is at H level, but I have been thinking about which conditions determine the level of 23C. The negative input terminal of the comparator 68 is connected to the output of the aforementioned OP amplifier 59, and is compared with the voltage divided by the resistors 66 and 67 of the constant voltage circuit 45, and the output voltage of the OP amplifier 59 is higher. When the output voltage of is lower than the voltage at the connection point of the resistors 66 and 67, the output of the comparator 68 becomes H level, the inverter 77 becomes L level, and the analog switch 23 is opened between 23a and 23b. In the morning, no sound is emitted from the sounding body 8 even during the self-timer.

In this case, since the 76c terminal of the analog switch 76 is at H level, conduction occurs between 76a and 76b, and the light emitting diode 9 blinks instead of the sounding body 8, as will be described in detail later. That is, when the output voltage of the OP amplifier 59 becomes below a certain value, the self-timer display element is switched from the sounding body 8 to the light emitting diode 9. In other words, the noise level around the camera is so high that it is impossible to confirm the sound from the sounding body at the subject position, or the distance between the camera subject is too long (however, the lens aperture ring is adjusted to that distance), and the same problem occurs. When the sound cannot be heard or a combination of the two, the self-timer display element switches from the sounding body 8 to the light emitting diode 9, and the self-timer display can be visually confirmed. Furthermore, in the present invention,
The reason why the self-timer operating element is switched from the sounding body 8 to the light emitting diode 9 can be confirmed by the color of the light emitted from the light emitting diode 9. This point will be explained below.

First, the light emitting diode 9 will be explained. The light emitting diode 9 is a variable color light emitting diode, as shown in FIG.

FIG. 7 is a schematic diagram and an equivalent circuit diagram of the light emitting diode shown in FIG. It is a variable color light emitting diode.

Green light is emitted by passing a current from 9a to 90 direction.
Red light is emitted by passing a current from 9b to 90 direction. Yellow light is emitted by simultaneously passing current from 9b to 9c in the direction from 19a to 9C.

As described above, the comparator 68 is a comparator that outputs an H level under the condition that the sound from the sounding element 8 cannot be heard at the subject position, regardless of the cause. The comparator 69 has its positive input terminal open.
Amplifier 44 (2nd output, connected to a constant voltage) is a comparator that outputs an H level when the noise around the camera is too loud and the sound from the sounding element 8 cannot be confirmed at the subject position. The positive input terminal of the generator 70 is connected to the output of the OP amplifier 55, and when compared with a constant voltage, the distance between the camera and the subject is too long and the sound from the sounding body 8 cannot be confirmed at the subject position (the distance between the lens and the subject is too long). (match the rings)
This is a comparator that outputs an H level. Next O
A total of four cases in which the P amplifier 59 becomes F at a certain voltage or higher and the comparator 68 becomes H level will be explained.

1) When the noise around the camera is too loud, the outputs of comparators 68 and 69 are H level and the output u of comparator 70 is L level. Therefore, AND gate 73 is at 1 degree level, OR gate 74 is at H level, and OR gate 75 is at L level. level. In addition, the output of the AND gate 19 is connected to the AND gate 78 via an analog switch 76.
．． Since it is added to the input of 79, the AND gate 78
Only the same signal as that of the AND gate 19 appears at its output.

That is, only the element 92 of the light emitting diode 9 is activated every % seconds (
To be precise, the IIG(z) flashes in red.

++) If the distance between the camera objects is too long i/ffi, the outputs of the comparators 68 and 70 will be at the HH level, and the outputs of the comparator 69 will be at the lt1 level. Therefore, the AND gate has a 73-dL level, the OR gate has a 741-dL level,
Since the OR gate 75 becomes H level, only the element 9□ of the light emitting diode 9 blinks in green every % seconds.

If the cases of rat)t)++) occur at the same time, the comparators 68 to 70 all become H level. Therefore, AND gate 73 is at L level and OR gate 1-74.75 are both at H level, so light emitting diode 9 is connected to elements 91 and 9.
□, 4 currents flow for both the main twist and flash in yellow every % seconds.

1v) If the noise around the camera and the distance between the camera and the subject do not exceed their limits individually, but the combination of the two makes it impossible to hear the sound from the sounding element 8 at the subject position, the comparator 68 is set to H level, rate 69.7
0 is L level. Therefore, AND gate 73 becomes H level, OR gate 74.75 also becomes H level, and element 9. of light emitting diode 9, similar to case 111).
,9. A current flows in both, and it flashes in yellow every % seconds.

To summarize the above, the self-timer operation is started by setting the camera to the self-timer operating state and pressing the release button down to the second stroke. As a display element, under conditions where the sound from the sounding body can be heard at the subject position, the sounding body is used, and depending on the surrounding noise level and camera subject distance, the sound volume is always constant and moderate at the subject position. Control Otono so that In cases where the surrounding noise level has increased and the sound from the sounding device cannot be heard for a long time, the self-timer display switches from the sounding device to the light emitting diode.
It flashes in red to notify the user ((()) that the surrounding noise is loud. Or, if the distance between the camera subjects is long,
If the sound from the sounding body becomes inaudible, the light emitting diode will similarly switch to a flashing green light to notify the user of the long distance between the camera subjects. In addition, if both of the above occur simultaneously, or if there is no time to listen to the sound from the sounding body at the subject position due to the combination of the surrounding sound level and the distance between the camera and the subject, the light emitting diode will be used in the same way. It flashes in yellow to let you know that the switching is not caused by the noise level or the distance between the camera and the subject.

When the self-timer operation based on the display of the sounding body or the light emitting diode is completed, the shutter of the camera is operated to start and end the exposure.

As explained above, according to the present invention, the installation position of the lens distance ring is electrically detected, and when it exceeds a certain limit value, the self-timer operation display element is activated by switching the analog switch. The self-timer operation can be confirmed visually by switching from the body to the light-emitting element.
- Even if the sound of the photoacoustic body cannot be heard, the light from the light emitting element can be confirmed instead, the self-timer operation can be displayed efficiently, and the display identification range can be expanded1.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and is an external view of a camera equipped with a self-timer device, and FIG. 2(a).・Figure 2 (b) and Figure 9'2 (C) show the positional relationship between the self-timer set lever and the fixed index shown in Figure 1.
>H2 diagram (a) shows the release button set to the locked state.
Figure 2 (b) is a diagram when the camera is set to normal shooting mode, Figure 2 (C) is a diagram when it is set to selfie mode, and Figure 3 is a diagram of the camera shown in Figure 1. Self-timer circuit diagram, @4111(a) is shown in Figure 3.
8A, FIG. 4(b) is a detailed diagram specifically showing the hearing correction circuit B shown in FIG. 3, and FIG.
Figure 6 is a circuit diagram showing the three types of auditory sensation correction circuits shown in Figure 4 (a) and 4(b). is a schematic diagram of the light emitting diode shown in FIG. 1, and FIG. 8 is a frequency characteristic diagram of the circuit shown in Hatake 3-1. l...Camera body, 6...Self-timer set lever 17...Shutter button, 8...Sounding body, 9
... Light emitting diode, 10... Generator, l:3...
・Counter, 28...B 131), 34.35.
36... Hearing correction circuit. “...!F' ”h

Claims (2)

[Claims] (1) In a camera that uses sound emitted from a sounding body built into the camera to display the operation of the camera's self-timer, the volume of the sounding body is controlled according to the distance ring setting position of the photographic lens, and the distance ring is set. A camera display device characterized in that when a position exceeds a certain limit value, a sounding body stops producing sound and a light emitting element starts displaying a self-timer operation. (2) The light emitting element is a light emitting diode, and blinks at the same period as the sound emitted from the sounding body to indicate the operation of the self-timer.
1) The camera display device described in item 1).