JPS6246846B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-timer device that uses a sounding body to display the operation of the self-timer, and is capable of changing the volume of the sounding body in accordance with the level of surrounding noise perceived by human hearing. It is something.

2. Description of the Related Art Cameras are already known in which a sounding body is used to indicate the operation of the camera's self-timer, and the user is informed by sound that the self-timer is operating. However, in such a camera, the volume emitted from the sounding body is constant, so when the surrounding noise is large, the problem arises that it is difficult to hear the sound from the sounding body due to the sound masking effect. On the other hand, if the sound is emitted in a quiet place, there is a risk that it will not only disturb others, but also cause the user to attract attention from those around them, making it difficult to take natural photos.

Therefore, as a countermeasure to the above problem, proposals have been made such as making it possible to change the volume from the sounding element with a switch, but this is not sufficient as a countermeasure against changes in the amount of surrounding noise while the self-timer is operating. Nakatsuta.

Therefore, the applicant filed a patent application for a camera self-timer device that first detects the amount of noise around the camera and can change the volume of the sounding body during the period in which the sound is emitted according to the detected amount. This was proposed as No. 129173, and measures against noise were taken.

However, even with such a proposal, the output voltage of the sounding body does not correspond to human hearing, so there is a drawback that the volume of the sounding body cannot be accurately controlled.

The present invention has been made in view of the above-mentioned problems, and is a self-timer device for a camera that displays a self-timer operation display by driving a sounding body, which detects the surrounding sound volume and outputs a signal at a level corresponding to the surrounding sound volume. Detection circuit (embodiment, 8, 25 in Fig. 3,
27, 28, 29, 30, 31, 32, 33. ) and a filter circuit (embodiment, FIG. 4a, FIG. 4b; corresponding to 90-93, 96-98, 100 in FIG. 5) having a plurality of different frequency pass characteristics, A hearing correction circuit (embodiment, corresponding to 34, 35, and 36 in FIG. 3) inputs a signal from the circuit and outputs the signal through a filter circuit, and adjusts the volume of the sounding body based on the output of the hearing correction circuit. Volume adjustment circuit (embodiment, 40 to 44, 59, 61, 63, 6 in Fig. 3) for adjusting the
Corresponds to 5. ), and a selection circuit (embodiment, shown in FIG. 45-53, 37-39; 94, 95 in Figure 5,
Corresponds to 99. ) to allow self-display to be performed at a volume that corresponds to human hearing.

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

Figure 1 shows the appearance of a single-lens reflex camera.
In the figure, 1 is the camera body, 2 is an exchangeable photographic lens, 3 is the top cover of the camera body, 4 is the accessory shoe disposed on the top cover 3, 5 is the winding lever, and 6 is the self-timer set and shutter. By aligning the instruction on the button lock lever with any of the fixed marks L, A, or S on the top cover 3, the camera is locked by the switching mechanism located inside the camera, and the camera is placed in the normal shooting state. and the self-timer shooting preparation state. 7 is a shutter button, and 8 is a sounding body for displaying a self-timer, which is attached closely to the main body 1.

2a, 2b, and 2c show the positional relationship between the fixed indicators L, A, and S shown in FIG. 1 and the self-timer set lever 6, and 9 is a light emitting diode for display; 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.
When c is aligned with the fixed index L on the top cover, a switching mechanism (not shown) makes it 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, as shown in FIG. 2b, when the instruction 6c of the self-timer set lever 6 is set to the fixed index A, the shutter button 7 becomes ready to be depressed by a switching mechanism (not shown). If the shutter button 7 is pressed down here, a power switch (not shown) is closed, and if the shutter button 7 is further pressed down, 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, as shown, and cannot be seen from the outside. Next, as shown in Fig. 2c, when setting the indication 6c of the self-timer lever 6 to the fixed index S,
The self-setting switch 12 shown in FIG. 3 is closed.
In this case, the light emitting diode 9 is not shielded by the tip 6a of the self-timer set lever 6, so that the subject or the photographer can perceive the light generated 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-operation switch 11 shown in FIG. If the surrounding noise is large or the distance between the camera subjects is large, the sound from the sounding element 8 will stop and the light emitting diode 9 will turn off the sounding element. It flashes at the same frequency as the intermittent sound, indicating that the camera is in self-timer shooting mode, and shooting will begin automatically after a certain period of time.

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

Reference numeral 10 denotes an oscillator that generates a clock pulse with a fundamental frequency of 8.192 KHz. This oscillator 10 supplies the clock pulse to a clock input terminal 13a of a counter 13 via switches 11 and 12. The oscillator 10 includes inverters 10 ₁ , 10 ₂ and a resistor 10
₃ , ₁₀₄ and a capacitor ₁₀₅ . 11 is a self-operating switch, and this switch 11 is closed in conjunction with the second stroke of the shutter button 7. 12 is a self-setting switch, and this switch 12 is a self-timer set lever 6.
It is closed by aligning it with the position of index A.
A counter 13 divides the frequency of the clock pulse input to the clock input terminal 13a, and outputs pulses having different frequency division ratios from each Q terminal. From _Q3 terminal
It outputs pulses with a fundamental frequency of 1.024KHz, 512Hz from the _Q4 terminal, 1Hz from the _Q13 terminal, and 1/8Hz from the _Q16 terminal. When a high level (hereinafter referred to as H level) is input to the reset terminal 13b of the counter 13, the frequency dividing operation is stopped and all Q terminals become low level (hereinafter referred to as L level). 14 is an RS flip-flop constituted by NAND gates 14 ₁ and 14 ₂ , and is connected to the reset terminal 13b of the counter 13. 1
5 is an inverter, 16 is a switch which is closed in conjunction with the winding of the winding lever 5 shown in FIG.
It is opened in conjunction with the movement of the rear shutter curtain (not shown). 17 is a resistor, one terminal of which is connected to the power supply _VDD . 18 is an inverter and the counter 13
The output of the _Q16 terminal is inverted and input 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 sounding body 8. 22 is an analog switch, and when 22c becomes H level, 22a, 2
2b is in a short-circuited and conductive state. (The same goes for the analog switch, and when c goes to H level, conduction occurs between a and b.) 23 is an analog switch, and 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 inverter, and 27 is an amplifier, which amplifies the collected sound signal when the sounding body 8 operates as a microphone. 28 is a 512-stage BBD (Bucket Brgade)
Device) to convert the analog signal from the amplifier 27 into 2
8c and is delayed in synchronization with two-phase clocks of mutually opposite phases inputted to 28a and 28b 28d
Output from the terminal. 29 is an inverter, 30 is
The OP amplifier, 31, 32, and 33 are resistors. 3
Reference numeral 4 denotes a hearing correction circuit having characteristics of the A curve 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 Fig. 6.
It has the characteristics of a curve. 37, 38, and 39 are analog switches. 40 is a diode, 41 is a resistor, and 42 is a capacitor, and these three components constitute an average value detection circuit. 43 is a resistor, and 44 is an OP amplifier that is used as a buffer amplifier with follower connection. A constant voltage circuit 45 supplies a constant voltage to a resistor 46, an information resistor 54, and a resistor 66, which will be described later. 46 to 48 are resistors forming a voltage dividing circuit for the voltage of the constant voltage circuit 45. 49 and 50 are comparators that connect the voltage of the OP amplifier 44 to resistors 46 and 4, respectively.
7 and the voltage at the connection point of resistors 47 and 48 are compared. 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 as a follower and operates as a buffer amplifier. 5
6 is an OP amp, 57 and 58 are resistors and OP amp 5
6 and inverts the output of the OP amplifier 55. 59
is an OP amplifier, 60 to 63 are resistors, and OP amp 4
4 and the output of the OP amplifier 56. 64 is a resistor, 65 is a transistor, and the output of the AND gate 19 is divided by the impedance between the resistor 20 and the collector and emitter of the transistor 65. 66,6
7 is a resistor that divides the voltage of the constant voltage circuit 45. 6
8 to 70 are comparators, 71 and 72 are inverters, 73 is an AND gate, 74 and 75 are OR gates, 76 is an analog switch, 77 is an inverter, 78 and 79 are AND gates, the light emitting diode 9 is two light emitting diodes 9 ₁ , It is composed of 9 ₂ and has a variable color, 9 ₁ is a green light emitting diode, 9 ₂ is a red light emitting diode, 9 a,
9b, 9c are the three terminals of the light emitting diode, 9a,
9b is an anode, and 9c is a cathode.

Next, the operation of the above configuration will be explained with reference to FIG.

By setting the self-timer setting lever 6 as shown in FIG. 2c, the self-setting switch 12 is closed.

Then, by winding up the winding lever 5, the switch 16 is closed. When the shutter button 6 is pressed, a power switch (not shown) is turned on and power supply voltage is supplied to each part. Then, by further pressing the shutter button 6, the self-operating switch 11 is turned on and the fundamental frequency of the oscillator 10 is turned on.
A pulse of 8.192 KHz is applied to the clock input terminal 13a of the counter 13. Since the switch 16 is turned on when winding is completed, the switch 16
Since the connection point between and the resistor 17 is at L level, that is, one end of the input of NAND gate ₁₄₁ of RS flip-flop 14 is at L level, its output is at H level. In addition, the input to the NAND gate ₁₄₂ is such that the output of the NAND gate ₁₄₁ is at H level, the output of inverter 15 is at H level, and the output of inverter 18 is at H level (until just before the _Q16 terminal of counter 13 changes from L to H level). To become, Nand Gate 1
The output of counter ₁ is at L level, and the reset terminal 13b of counter 13 is at L level, that is, the output of counter 1 is at L level.
3 starts the timing operation. Therefore, from the AND gate 19, the product waveform of Q ₃ and Q ₁₃ terminals, that is, 1/2 second
It is intermittent with a 1.024KHz pulse, and the L level is output alternately for the next 1/2 second (the timing is the same as the voltage waveform shown in Figure 8, ○A). Then, when the _Q16 terminal changes from L to H level, that is, the counter 13
Eight seconds after starting timekeeping, the inverter 18 goes low, so the output of the NAND gate ₁₄₂ of the RS flip-flop 14 and the reset terminal 13b of the counter 13 go high, and the counter 13 stops measuring time. Therefore, a self-timer is executed for these 8 seconds, and its operation is displayed by the sounding unit 8 producing a sound or by flashing a light emitting diode as described later. Also, the L of the _Q16 terminal of the counter 13 →
A shutter control circuit (not shown) operates triggered by the H level change, and a shutter leading curtain (not shown) starts running. Next, the operation during the self-timer for 8 seconds after the counter 13 starts timing will be explained.

As mentioned above, during the period when the Q13 terminal of the counter ₁₃ is at H level, a pulse with a fundamental frequency of about 1 KHz at the _Q3 terminal is intermittent from the AND gate 19, passes through the resistor 20,
It is input to the amplifier 21. After appropriate amplification by the amplifier 21 (see ○A in Figure 8), the analog switch 22-2
It is input to the 2a terminal. By the way, since the 22c terminal of the analog switch 22 is connected to the Q13 terminal of the counter ₁₃ ,
During the period when the 1KHz pulse is intermittent, the analog switches 22a and 22b are electrically connected, so that the output of the amplifier 21 appears as it is at the 22b terminal 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 analog switch 23c terminal is connected to the inverter 77, and the input of the inverter 77 is connected to the output of the comparator 68.
Whether conduction occurs between 23a and 23b is determined by the level of the comparator 68. The output level of the comparator 68 will be described later. Therefore, 23 of analog switches 23
When c is at H level, the output voltage of the amplifier 21 is applied to the sounding element 8, and the fundamental frequency is 1K at intervals of 1/2 second.
An intermittent Hz pulse tone will be emitted during the 8-second self-timer operation. Next, sounding body 8 is 1/2
It operates as a microphone during the period other than the period in which seconds are sounded, that is, the remaining 1/2 second. That is, since signals of opposite phases are inputted to the 22c terminal of the analog switch 22 and the 25c terminal of the analog switch 25 by the inverter 26, the analog switch 2
3 is conductive, during the period when there is no sound from the sounding body 8, the signal from the sounding body 8 operating as a microphone (signal corresponding to the noise around the camera) is transmitted through the analog switch 25 ( 25a and 25b) and is input to the amplifier 27. Then, the amplifier 27 amplifies the voltage appropriately in response to the noise around the camera from the sounding body 8,
Output. For the analog signal waveform, refer to the voltage waveform in Figure 8 (○). The output of amplifier 27 is applied to BBD 28 and resistor 31. 28a of BBD28,
Pulses with a fundamental frequency of 512 Hz, which are in opposite phases to each other, are input to the terminal 28b by the inverter 29, and the relationship between the delay time and clock frequency of the BBD 28 is well known: t _D = N/2cp t _D : Signal delay time, cp : clock frequency,
Since N is the number of transfer stages, the signal delay time t _D of the BBD 28 with N=512 stages is 1/2 second. This is shown by the voltage waveform of ○C in FIG. 8, in which the voltage waveform of ○B is delayed by 1/2 second. Next, the signals at points ○R and ○C are added and inverted by the resistors 31 to 33 and the OP amplifier 30, resulting in the signal ○D in FIG. This voltage waveform is the 8th
This is shown as a composite waveform of Figures ○B and ○C. However, the voltage waveform shown in ○D in FIG. 8 is obtained by inverting its phase. As can be seen from this waveform, unlike the voltage waveform at points ○ and ○, a continuous waveform is obtained, and the degree of freedom in signal processing has been greatly expanded since then. Next, the signals at the two points include three types of auditory correction circuits: an auditory correction circuit A34 with an A curve, an auditory correction circuit B35 with a B curve,
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 around the camera collected by the sound generating unit 8 with characteristics similar to the auditory sense. Moreover, one of three types of curves A, B, and C is selected by analog switches 37 to 39, which will be described later, depending on the ambient noise level. Specifically, the ambient noise is 60dB (OdB=0.0002μ
bar) or less, select A curve, if 60 to 85 dB, select B curve.
If the curve is 85dB or more, use the constant voltage circuit 45, resistors 46 to 48, and comparator 4 as described later.
9,50, AND Gate 51, Noah Gate 52,
53, selected by analog switches 37 to 39. Now, three types of auditory sensation correction circuits 34 to 36 having the characteristics shown in FIG. 6 will be specifically explained. 4a and 4b show a specific example of the auditory sensation correction circuit, and FIG. 4a shows the auditory sensation correction circuit A34 in the fourth
FIG. b shows the auditory sensation correction circuit B35. In Fig. 4a, 34 ₁ , 34 ₂ , 34 ₇ are capacitors 34
₃ , ₃₄₄ , and ₃₄₆ , resistors ₃₄₅ , and ₃₄₈ indicate OP amplifiers that operate as buffer amplifiers. That is, FIG. 4a shows capacitors 34 ₁ , 34 ₂ and resistor 3
4 ₃ and 34 ₄ form a second-order high-pass filter, and the resistor 34 ₆ and capacitor 34 ₇ form a first-order low-pass filter, resulting in a filter having the characteristics of the curve A in FIG. 6. Also, in Figure 4b,
35 ₁ is a capacitor, 35 ₂ is a resistor, 35 ₃ is an OP amplifier that operates as a buffer amplifier,
The capacitor ₃₅₁ and the resistor ₃₅₂ form a first-order high-pass filter, which has the characteristic of curve B in FIG. 6. 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. And each hearing correction circuit 34
The signals passing through 36 are respectively connected to analog switches 37
~39 is input. This analog switch 37
~39 will be described in detail later, but AND gate 5
1. Only one of the three is selected by the NOR gates 52 and 53. That is, the output signal of the OP amplifier 30 is audibly corrected for only one of the A, B, and C curves and is applied to the anode of the diode 40. The diode 40, the resistor 41, and the capacitor 42 constitute 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. Ru. Here, the resistor 41 and capacitor 42 determine the attack time from when a signal appears at the cathode of the diode 40 to when it starts controlling the transistor 65 (described later), and after the signal disappears from the cathode of the diode 40, the transistor 65 starts controlling. The recovery time until it runs out is determined by the capacitor 42 and resistor 43. 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 terminals of the comparators 49 and 50 and the resistor 61.
is applied to Therefore, first, comparator 4
The operations of 9 and 50 will be explained. OP amp 4
The output voltage of 4 is the voltage resistance 46 of the constant voltage circuit 45.
It is compared with the partial pressure by 48 by comparators 49 and 50. The voltage division level created by the resistors 46 to 48 corresponds to the noise level around the camera.
Resistor 4 corresponds to the output voltage of OP amplifier 44.
The connection points of 7 and 48 are equivalent to a noise level of 60 dB,
The connection point between resistors 46 and 47 is set so that the noise level is 85 dB. First, immediately after the power is turned on, while no output voltage appears in the OP amplifier 44, the voltages at the positive input terminals of the comparators 49 and 50 are zero, so the outputs of the comparators 49 and 50 are both at L level. Therefore, the output of the NOR gate 52 is H
level, so analog switch 37 of 37
The voltage of the c terminal also becomes H level, and 37a, 37b
In other words, the signal from the hearing correction circuit A34 is applied to the anode of the diode 40, and a voltage subjected to average value detection appears at the output of the OP amplifier 44. The voltage is again applied to the comparators 49 and 50 through the resistors 46 and 50.
48, but if the noise level around the camera is below 60 dB, the outputs of the comparators 49 and 50 will always be at the L level, and the auditory sense correction will continue to select the A curve. However, when the noise level exceeds 60 dB (but below 85 dB), the comparator 49 is at the L level, but the comparator 50 is inverted to the H level. Then,
The NOR gate 52 becomes L level, the AND gate 51 becomes L level, the NOR gate 53 becomes H level, conduction is established between 38a and 38b of analog switch 38, and the B curve is selected for auditory correction. When the noise level further increases and exceeds 85 dB, the comparators 49 and 50 both go to the H level, the AND gate 51 goes to the H level, and the NOR gates 52 and 53 go to the L level, so that 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 Figure 3, three types of hearing correction circuits 34 to 36 are connected to three analog switches 3.
Although only one type was selected and used in Sections 7 to 39, the method shown in FIG. 5 may be used to further simplify the circuit. Figure 5 shows three types of auditory correction combined into one, 90 and 91 are capacitors, 92 and 93 are resistors, 94 and 95 are analog switches, 96 is an OP amplifier that operates as a buffer amplifier, 97 is a resistor, and 98 is a capacitor, 99 is an analog switch, and 100 is an OP that operates as a buffer amplifier.
It's an amplifier. To explain its operation, each terminal 94c, 95 of the analog switch 94, 95, 99
If c, 99c are L level, 94a, 94 respectively.
The portions between b, 95a and 95b, and 99a and 99b are open, and are the same as the hearing correction circuit having the A curve shown in FIG. 4a. Also analog switch 9
When the terminals 90c and 99c of the analog switch 90 and 99 are set to H level and the 95c terminal of the analog switch 95 is set to the L level, the analog switches 90a and 9 of the analog switch 90 and 99 are set to the H level.
0b, 99a and 99b are electrically connected, and as shown in Fig. 4b
This is the same as connecting a resistor between the input and ground of a hearing correction circuit with a B curve of Resistance is negligible. Also analog switch 94,9
When the respective terminals 94c, 95c, 99c of 5 and 99 are all set to H level, all analog switches become conductive, and the signal applied to the input passes through 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.

Comparator 4 in Figure 3 is configured to perform the above operations.
By assembling the gates of the outputs from 9 and 50, the terminals 94c and 95 of analog switches 94, 95, and 99 are connected.
c, 99c, the hearing correction circuits 34 to 36 and analog switches 37 to 39 in FIG.
can be replaced with only Fig. 5. Before explaining the resistor 61 and subsequent parts connected to the output of the OP amplifier 44 in FIG.
The signal from the 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 variable terminal 54a of the information resistor 54 increases as the lens distance ring approaches the closest distance, and decreases as the lens distance ring approaches infinity. Therefore, the voltage remains unchanged at the OP amplifier 5.
Appears at the output of 5, and further resistors 57, 58, OP
The signal is inverted and amplified by the amplifier 56. That is, the output of the OP amplifier 56 increases as the distance approaches infinity. The output voltage of the OP amplifier 56 and the output voltage of the OP amplifier 44 are controlled by resistors 60, 61, 63 and
It is calculated by the OP amplifier 59. Also resistance 62
is a level shift resistor. Therefore, the output voltage of the OP 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 transistor 65 decreases. 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. Furthermore, 23a, 23 of the analog switch 23
When there is conduction between B and B, 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, the noise level around the camera is low and OP.
When the output voltage of the amplifier 44 is low and the distance between the camera subjects is small, the lens distance ring is adjusted to the close-up direction, and when the output voltage of the OP amplifier 56 is low, the self-timer display is emitted from the sounding element 8. The sound becomes smaller. Conversely, if the noise level around the camera is high or the distance between the camera subjects is large and the lens distance ring is set to infinity, the self-timer display sound emitted by the sounding element 8 will be loud. It will become. Furthermore, even in the case between the two cases described above, the sound generation level of the sounding element 8 is appropriately adjusted depending on 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 analog switch 23 is at H level, but let's consider which conditions determine the level of 23c. The output of the aforementioned OP amplifier 59 is connected to the negative input terminal of the comparator 68, and the resistor 66 of the constant voltage circuit 45,
67, and if the output voltage of the OP amplifier 59 is larger, the output of the comparator 68 becomes L level and the inverter 77 becomes H level, and conduction occurs between 23a and 23b of analog switch 23, and the sounding element A sound is emitted from 8. but,
The output voltage of OP amplifier 59 is higher than that of resistors 66 and 67.
If the voltage is lower than the voltage at the connection point, the output of the comparator 68 becomes H level, and the
becomes L level and analog switch 23 of 23
The space between a and 23b is open, and no sound is emitted from the sounding element 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 falls below a certain value, the self-timer display element switches from the sounding element 8 to the light emitting diode 9. In other words, the noise level around the camera is so high that it becomes impossible to hear the sound coming from the sounding body at the subject's position, or the distance between the camera and the subject is too long (but the lens aperture ring is adjusted to that distance), and the same problem occurs. When the sound cannot be heard, or in a combination of both, the self-timer display element is switched from the sounding body 8 to the light emitting diode 9, and the self-timer display can be visually confirmed. Further, 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 FIGS. 1 and 3, and this device is a GaP
This is a single pellet type variable color light emitting diode that has a green light emitting part and a red light emitting part in a single pellet.
By passing a current in the direction from 9a to 9c, green light is emitted, and by passing a current in the direction from 9b to 9c, red light is emitted. and 9b to 9c,
Yellow light is emitted by simultaneously flowing current from 9a 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 connected to the output of the OP amplifier 44, and compares it with a constant voltage.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 H level is detected. This is the comparator that is output. The comparator 70 has its positive input terminal connected to the output of the OP amplifier 55 and compares it with a constant voltage. This is a comparator that outputs an H level when the rings are matched). Next, four cases in which the OP amplifier 59 becomes lower than a certain voltage and the comparator 68 becomes H level will be explained.

When the noise around the camera is too loud, the outputs of comparators 68 and 69 are at H level and the output of comparator 70 is at L level, so AND gate 73 is at low level, OR gate 74 is at H level, and OR gate 75 is at L level. Become. Also, the output of AND gate 19 is output from analog switch 7.
6 to the inputs of AND gates 78 and 79, the same signal as that of AND gate 19 appears at the output of only AND gate 78.
That is, only the element ₉₂ of the light emitting diode 9 is 1/2
It flashes in red every second (1KHz to be exact).

When the distance between the camera objects is too long, the outputs of comparators 68 and 70 are at H level, and the output of comparator 69 is at low level. Therefore, the AND gate 73 is at the L level, the OR gate 74 is at the L level, and the OR gate 75 is at the H level, so that only the element ₉₁ of the light emitting diode 9 blinks in green every 1/2 second.

)) If the cases 68 to 70 occur at the same time, all of the comparators 68 to 70 become H level. Therefore, AND gate 73 is at L level and OR gates 74 and 75 are both at H level.
Current flows through the light emitting diode 9 to both the elements 9 ₁ and 9 ₂ , causing the light emitting diode 9 to flash in yellow every 1/2 second.

When 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 unit 8 at the subject position, the comparator 68 is at H level, and the comparator 68 is at H level. 69 and 70 are at L level. Therefore, the AND gate 73 goes to H level, and the OR gates 74 and 75 also go to H level. As in the case where the current flows through both elements ₉₁ and ₉₂ of the light emitting diode 9, they blink in yellow every 1/2 second. do.

To summarize the above, set the camera to the self-timer mode and press the release button to the second position.
By pressing down to the stroke, the self-timer operation starts. Under conditions where the sound from the sounding body can be heard at the subject position, the sounding body is used as the display element, and the surrounding noise level,
To control the volume so that it is always felt to be constant and appropriate at the subject position according to the camera subject distance. In addition, if the surrounding noise level increases and the sound from the sounding element becomes inaudible, the self-timer's display element switches from the sounding element to a light emitting diode and blinks in red, indicating that the surrounding noise is loud. This will also be communicated to the user. Alternatively, if the distance between the camera subjects is long and the sound from the sounding body becomes inaudible, the light emitting diode will similarly switch to a light emitting diode and blink in green, indicating to the user that the distance between the camera subjects is long. Inform. In addition, if both of the above occur simultaneously, or if the sound from the sounding body cannot be heard at the subject position due to a combination of the surrounding noise level and the distance between the camera and the subject,
Similarly, it switches to a light emitting diode and blinks in yellow, indicating that the switching is not caused by the noise level or the distance between the camera and the subject alone. 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, by passing the output signal of the surrounding noise from the sounding body used as a microphone through the audibility correction circuit, the signal becomes similar to human hearing, and by using that signal, the sounding body This has the effect of accurately controlling the volume.

Furthermore, by switching the audibility correction circuit according to the surrounding noise level, it becomes possible to control the volume of the sounding body in a more realistic manner.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, and Fig. 2a, Fig. 2b, and Fig. 2c show an external view of a camera equipped with a self-timer device, and Fig. 2a, Fig. 2b, and Fig. 2c are fixed to the self-timer set lever shown in Fig. 1. The positional relationship with the index is shown. Figure 2a is a diagram when the release button is set to the locked state, Figure 2b is a diagram when it is set to normal shooting mode, and Figure 2c is a diagram when it is set to selfie mode. 3 is a self-timer circuit diagram of the camera shown in FIG. 1, FIG. 4a is a detailed diagram specifically showing the hearing correction circuit A shown in FIG. 3, and FIG. 5 is a detailed diagram specifically showing the auditory sensation correction circuit B shown in FIG. 5, a circuit diagram showing the three types of auditory sensation correction circuits shown in FIG. FIG. 7 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 FIG. 3. 1... Camera body, 6... Self-timer set lever, 7... Shutter button, 8... Sound element, 9... Light emitting diode, 10... Oscillator, 1
3...Counter, 28...BBD, 34,3
5, 36... Hearing correction circuit.

Claims (1)

[Claims] 1. In a camera self-timer device that displays a self-timer operation display by driving a sounding body, the detection circuit is different from a detection circuit that detects ambient sound volume and outputs a signal at a level corresponding to the surrounding sound volume. an audibility correction circuit that includes a filter circuit having a plurality of frequency passing characteristics, inputs a signal from the detection circuit and outputs the signal through the filter circuit; and adjusts the volume of the sounding body based on the output of the audibility correction circuit. A volume adjustment circuit and a selection circuit for selecting a filter circuit with higher-order characteristics as a filter circuit of the audibility correction circuit as the ambient volume level is lower according to the ambient sound level detected by the detection circuit. A camera self-timer device featuring: