JPS5895721A - Accessories of video apparatus - Google Patents

Abstract

PURPOSE:To obtain a video apparatus system having high reliability, by providing an interchangeable lens having a circuit for detecting a conducting state of an electric signal terminal for sending and receiving a signal between a camera and a lens. CONSTITUTION:c1-c5 and c1'-c5' (d1-d5) are contacts of a camera side and a lens side, and an exposure operating circuit 4 of the camera side calculates an aperture value AV in accordance with input information, and inputs it to a subtracting circuit 5. To the circuit 5, a full-aperture value of the lens side is converted by an outputting circuit 6 and is inputted as 00 of 2 bits and 01 in case of F1.0 and F1.2, respectively, a control aperture value signal DELTAAV is outputted by subtract-processing the calculated aperture value from the circuit 4 and the full-aperture value, and it is outputted by 3 bits as aperture information, to the signal terminals c1-c3 through a signal transferring circuit 8. This aperture value signal DELTAAV is transmitted to an aperture controlling circuit 10 and a driving circuit 11 through the terminals c1-c3, d1-d3 and a circuit 9, and an aperture device is controlled to the calculated signal DELTAAV.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention reliably transmits and receives electrical signals between a video device such as a single-lens reflex camera or a video camera and an interchangeable lens holder or other seat attachment that is detachably attached to the video camera. The present invention relates to a companion accessory comprising a circuit for detecting a failure in the connection state of the connection portion of the immersion means.

It is conceivable to automatically control the camera using signals from the main body of the image display device. In this way, when the electrical signal processing between the video equipment and the 1-touchment is done by attaching the electrical signal to the main body of the equipment, there is no risk of foreign matter adhering to one or both of the connections on the bottom side of the connection, corrosion resistance, or poor connection. There is a risk that the electric signal will not be immersed due to such reasons, and that it will not only not work, but also cause malfunction.

The present invention provides an accessory equipped with a circuit for detecting a defective connection state of the above-mentioned electric signal receiving means, and provides a system that enables an operator to recognize and check defective locations. Furthermore, the present invention provides the operator with a confirmation that there is no malfunction in the power or other connection parts between the main body of the device and the attachment.ii1! The present invention provides a device that can quickly respond to failures by providing a means for connecting the electrical signal terminals. To provide a device convenient for detecting defects.A further object of the present invention is to provide a means for detecting defective electrical connections as a means of notifying an operator when an electrical connection between a camera and an attachment is defective. By using the signal from the sound source as the sounding side n signal from the sounding body, it is possible to more accurately notify a failure. camera side (Fig. 1a) and lens N
(Figure 1b) shows the mounting part.

Reference numeral 1 indicates a mounting portion of a single-lens reflex camera, such as bayonet mount means. The bayonet mount 60 is fixed to the camera body (not shown), and the bayonet mount l has signal terminals c, -c, . ...C,
has been established. 2 is a bayonet mount ring that is rotatable relative to the fixed part of the interchangeable lens, and includes bayonet claws 2a, 2b, 2C that are coupled to the camera side bayonet claws 1m-1b-1c, and the electrical signal terminal C8...
...Electric signal terminal d1 provided at a position that can be connected to C1
・・・・・・d, has i.

In Fig. 2, the Cl-Cm + d+ -daFi conduction state is connected at the electrical connection terminals on the camera side and the lens side. 4 is an output calculation circuit on the camera side, and it is connected from the known shooting information input means. The aperture value (AV) is calculated based on the input information of ・The 6-subtraction circuit 5 that is input to this descriptive 9-value AY signal subtraction circuit 5 inputs the open aperture value (λVo) information on the lens side. The lens-side wide-open aperture image information is provided by conversion circuits 6a and 6 that receive signals from the lens-side wide-open aperture 9-value output circuit 6.
2-bit signal or signal terminal d4, dl, C4 depending on b
・0 is input to the subtraction circuit through circuit 71 and 7b of the aperture p value input circuit 7 on the camera side through el.) For example, when the aperture value of the lens is Fl, 0, the F12 bit is input. @ Ri Signal 00. 0 for F'1.20
1. In the case of Fl, 4, it is converted into 10 in the output circuit 6 on the lens side, and the 2-bit signal is input to the subtraction circuit 5 on the camera side. The softness value ΔAVt that should be controlled according to the shooting information is calculated by subtracting the calculated aperture value and the maximum aperture) value, and the signal is transmitted after converting 9 aperture C ([ΔAY into a 3-bit electric signal). It is outputted to the signal terminals C1, C1, and C3 provided on the bayonet mount section 1 through the circuit 8.This signal terminal C
The signals output to 3, C1, and C3 are aperture image information determined based on the photographing information signal, and are output from the camera 2 side to the V lens I.
The 3-bit electrical signal transmitted by IIK outputs 0.
This aperture value signal ΔAY is applied to the electrical signal terminal CI-C!・CM
+dl・d,・d, and then further to the lens side transmission circuit 9
to the aperture control circuit 10 on the lens side. Aperture p drive circuit 11
The aperture value ΔAY calculated by the aperture 9 device (not shown)
E control.

Fig. 3Fi shows the continuity state of the electrical signal transmission stage using the system for testing the exposure control signal through the nine electrical signal terminals c1 to c1, dl-d, between the camera and the lens, as shown in Fig. 2. In Figure 0, which shows an example of detecting and notifying compliance, the NOT circuit has a first electrical signal terminal d on the lens side.

Detecting the output signal from the counter 13,
@14 forming the mode signal detection circuit is counter 1
This is a clock pulse generator that controls the operation of 3.

FIG. 3 will be explained below.

Symbol S is an input terminal for starting a continuity check operation, and this continuity check operation start signal is, for example, a pulse signal from a one-seat pulse generation circuit (not shown) generated by pressing the release button of a camera. Then, this check operation start signal is input to the shift register 14 and the OJK flip-flop 15. Shift register - 14 HD flip-flop circuits are connected in 5 rows to form 9 configurations. The timing chart of each part of the circuit in Figure 4 is the timing chart for each part of the circuit shown in Figure 4. Synchronized with clock pulse (Fig. 4+4)
, as shown in (5), becomes the state of the abridged signal l. From this rC, the camera side enters a continuity check state.

The shift register 14 has a five-stage configuration of 1) -FFI to D-FF5, and each D-FF2 to D-FF5 sequentially inputs the signal from the Q output signal end of D-FF1, and receives the signal from the clock pulse circuit 16. At the fourth clock pulse, the output terminal Q of the D-FF 5 becomes in the state of the signal 1. (#I4 diagram (5)) The output ID 411Q of D-FF5 is connected to the JK slip-n-lop OK input terminal, so that the output terminal Q of D-FF1 is is in a state where the signal is 0. (Figure 4 (3) D) The output signal of the output terminal Q of this JK flip 70 times w1115 (signal in Figure 4 (3)) should be checked for continuity.
The ΔA of the circuit 8 is used to send a check mode signal to the lens side, which is a check mode signal for
The outputs of Y, ・ΔAY, ・ΔAY are input to each OR circuit OR, ・0-・0几, and the output terminal of each OR circuit is connected to the camera side electric signal terminal C1・Cs ・Cs K! !
Continued・Annex No. 17-18-19 is each contact pair 'I'dl@
'f''f* This is a window comparator for cl/68m, only the first contact pair CI/dl is shown, and the other 18/19 are omitted as they have the same circuit configuration @ NAND circuit NAND 1 is the window comparator Input the output signals of the comparators 17, 18, and 19 and the signals N1 and N from the fourth and fifth electric signal terminals on the camera side and connect them to the Furi, Pflo, and Pf circuits D-PF6. FF6
In this embodiment, the sound generating unit SP, the AND circuit ANDI, and the pulse No. 16 generate the sound IglW & gold. ing.

Next, regarding this embodiment with the above configuration, the first electrical signal terminal C1
・Explain the operation in case of dl conduction @ Figure 5 shows the camera-side OR circuit OR and lens lIM.
OI, ・I, indicating the signal transmission circuit ΔAY are respectively 8 people ■ 1 and JK Furi! Guflo! This is the input signal from step 15. JK7 lip 70! When the output Q of the pull-up circuit 15 becomes the primary signal L, the diode becomes conductive and current flows through the resistor R, and the transistor Tr.

becomes conductive. Due to the voltage drop across the resistor metal, one point at one end of the collector of the transistor +1+ becomes low potential, and the transistor fr becomes non-conductive.As a result, one point of the collector of the transistor Try becomes a high potential, and the OR circuit 0 The output of 几 becomes a high potential output signal terminal 1. When the camera object color terminal C becomes a high potential, the connection with the lens @ signal terminal d is good, so C3 d.

Since the current i flows into the base end of the input stage transistor 11r of the circuit of ΔAY,' through the resistor &, a certain voltage drop occurs at the lens@signal terminal d1 and the camera@terminal CI. The voltage drop at the camera 1II (I! terminal C3) is input to the first contact window comparator 17 through the I-line Ns.

The window comparator 17 detects whether the input N is within the preset upper limit voltage value and lower limit voltage value range or not, and outputs the high potential logic sm when the input N1 is within the preset range. However, if the input island is outside the set range, a low potential -ffl value signal is output. Since the first electric signal terminal CI-d described above is in a good conduction state, a resistor is connected to the signal terminal C1. A signal corresponding to the voltage drop caused by & is input through the signal 111 Ng. When a voltage drop occurs due to this resistor k, the output of the signal line N1 is within the setting range of the upper and lower limit voltage values of the window comparator 17. Set it to enter.

As a result, when the first electric signal terminal C1 and dl have good continuity, the window comparator B1 outputs a high potential wI damage signal. From end d, signal -M
=i is input to the NOT circuit N0Til, and the NOT circuit 12
The output of is inverted and a pulse signal shown in FIG. 4 (7) is output.

The signal of this NOT circuit 13 is a clock pulse signal (fourth
Figure (6)) is input to the counter circuit 13, and after the reset of the counter circuit is released, the third and fourth electrical signal terminals C4, d, c, and 6 are in a good conduction state. The potential signal 1 is output to the signal MN+/N and input to the NAND circuit NANDI.One claw circuit is zero. Electrical signal terminal C1・dl t C
If the conduction state of m and d is good, then Fi * Na
・A voltage drop similar to the following occurs at the aforementioned system 1 electric polarization terminal CI・dl at N, respectively, and as a result, a high potential m is applied to each output bird 13 of the window comparators 18 and 19.
The buried area code is output.

Therefore, the electrical signal terminals C1・d, ~c at the 1st to 51st
, -d, are all in a good conduction state, the high potential wI signal l is input across the NAND10 input terminal, so the output of NAND1 is inverted and the low potential ai! Outputs a signal of 0 (
#! 4 Figure 10) The NAND circuit is input to the flip-flop circuit D-FF6, and further 1) - is inputted to 'F6 by FiNA.
The input signal of the ND circuit NANDI is more or less i! while passing through each gate. In consideration of the fact that the clock pulse generators 16 and 21 on the lens side and the camera side do not have the same period, an appropriate time delay is applied to the input terminal of the flip-flop D-FV5 through a delay circuit 22. The circuit output (Fig. 4, 9) is input, and this is used as a synchronization input signal for the 7-lip block of 1)-FF6/ (384
Figure 11) o In this case, in other words, when all electrical signal terminals are in good conduction, the sound generation circuit 20 performs sound generation without outputting the 1^ terminal wFi. I! 1Ijj Even if one number l is output, the current i does not flow to the base end of the transistor l'rl through the resistor shown in FIG. 5, and a high potential signal is generated at the signal terminal C1.
This high potential signal of the signal terminal C3 is inputted to the window comparator 17 by the signal 1mNm, and when the upper limit voltage value set in the window controller 17 is exceeded, the output terminal Bl of the window comparator 17 is outputted with a low voltage. Therefore, the other electric signal terminal C
Even if there is good conduction between 2・d and ~c@666, a high potential current signal 1 is output to NANDl, and that signal and the signal shown in FIG. 4 (9) from the delay circuit 22 are combined. 1) - The warning signal W shown in the fourth EQ is output to the FF6, which is input to the sound generation circuit 20 and activates the sounding element SP in synchronization with the clock pulse 23, which sends an electric signal to the camera and lens side to the operator. 6 shows a second embodiment of the present invention, and in the figure, the third
The same reference numerals as those in the figure refer to the same line as the line (2) in the previous embodiment.Summary: The configuration of the embodiment shown in Figure 3 is from the first ρ to the third electric m
If there is good continuity between terminals C and C3, a voltage drop will occur due to the nine circuits shown in Figure 5, and if there is poor continuity, no voltage drop will occur, and depending on the presence or absence of a voltage drop, a voltage drop will occur. This is to control the output of the window comparator 17 to a high potential or low potential logic signal to brake the sound generation circuit. This first embodiment allows the window comparator RU-17 to accurately adjust the setting of the output signal based on the input blade flaw numbers N and -N, thereby increasing the accuracy of the continuity check of the electrical signal terminal. I can do it, but it's a circuit! I
◎ OkL on the camera side
The check mode signals outputted from the terminals c, -d, -c, -dl- are input to the lens side. If the electrical signal terminals C1・d1 to C8・d have good continuity, the tf signal -Pl・P, ・P is passed through 1'
The output of D2 to JA is a low potential signal 0, the reset of the counter 13 is released, and Qm414 of the counter 13 shown in FIG. 4 (8) is output. And C4・d4
+ 'I'' (both NANI) 2 outputs a low potential signal and does not output a warning signal W. Also, electric signal terminals C and -d.

~ If either C1 or d has poor conduction, NAND
The output of 2 is a high potential fg, and a warning signal W is outputted through the 9AND circuit to notify the non-conducting state m.As described above, the present invention provides electric signal immersion means C1, d, ~C.
1·d, via an electrical signal (~■, ~Δλv,.

In the equipment that transmits and receives AVo 1', AVo,'), the good or bad conduction state of the electric signal immersion means is detected by the window comparators 17 to 19 and NANDl (Figs. 5 and 6), Based on the detection signal, a warning signal w-1 indicating malfunction of the electric signal immersion means can be outputted, and by incorporating Jin's device, the location of the equipment failure can be clearly indicated to the operator, and the failure can be quickly detected. can be dealt with.

The warning signals shown in Figs. 5 and 6 can be input to the light emitting control circuit that controls the light emitting element TW, for example, to notify a faulty connection by emitting light. If there is a risk that the operator may misunderstand due to too much information, it is appropriate to notify the operator with a sound signal as in this example. Also, as a method of using the warning signal W of this example, A warning signal W due to a poor electrical connection is input to the camera's operation prohibition circuit, preventing the camera's operation sequence from proceeding further, and may also be used to save power. In addition to the method of generating the continuity check operation start signal shown in FIG. 3 by the release operation of the camera, a dedicated switch may be provided to generate a one-shot pulse.

To create a highly reliable video equipment system by providing an interchangeable lens equipped with a circuit for detecting the #11 state of the electrical signal terminal (to prevent signal immersion between the camera and lens) as in the present invention. Also, as in the present invention, even if the accessory Fi projector main body is replaced, the accessory is equipped with a signal generation circuit for detecting continuity. This invention has a wide range of uses as it can be used not only for interchangeable lens scales but also for accessories such as intermediate chirps and motor drive devices 1 that fast-forward films and tapes.

[Brief explanation of the drawing]

Figures 1a and 1b show electrical signal immersion means (C1 to
c, , d, ~ds)) In Figure 0, the optical axis 01-0 is bent for convenience.6 Figure 2 shows the exposure control on the camera side and lens side. An explanatory diagram of the system〇 Figure 3 is a circuit diagram of the first embodiment of the present invention 〇 Figure 4 is a circuit diagram of the first embodiment of the present invention
Timing chart diagram of the embodiment shown in Figure 5 ti! Figure 3 is a rounded circuit diagram in which the 3 circuits in Figure 3 and No. 16 from the 1st comparator 17 cause a voltage drop in the signal trend C1 and dl. Figure 86 is the second circuit of the present invention.
Circuit diagram showing an example of @C1・2c,・cl・C3・c
, . . . Camera hook electric signal immersion means d, -d, ・d,
・d4・dl・・Electric signal immersion means on the lens side 0 about 10
Peng・OR1・0曵・0post...OR circuit 17・18・
19... Wind comparator 20... Pronunciation enclosure applicant Canon Co., Ltd. 9-3

Claims (1)

[Claims] (1) - The 11th
Receiving or transmitting electrical signals to or from animal image equipment.
The accessory is equipped with a signal terminal for reception, and a companion circuit that generates a signal t representing a failure in the case of a conduction failure in the electric signal terminal for transmission or reception. Accessories for Eirin equipment featuring: