JP2770999B2 - Display device with pointer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for displaying information processed by a digital circuit, that is, information relating to time, other physical quantities, or other information, using a pointer driven by a step motor. More specifically, in the case where the display area of the pointer has a limited shape such as a fan shape and the movable range of the pointer or its driving mechanism is mechanically limited accordingly, the display area in the display area is limited. The present invention relates to an apparatus having means for ensuring correct display.

2. Description of the Related Art A movable wire-type instrument (a circuit tester or the like) has long been known as a device that displays an electric quantity by a pointer that rotates in a fan-shaped region having a predetermined angle. Such an analog display system has many merits, because it has an advantage that it is easy to see and can instantaneously and intuitively determine the magnitude of the display amount at a glance, as compared with a so-called digital display system (numerical display). However, the movable wire-type instrument does not include a conversion circuit in the digital data and continuously consumes energy because the electric quantity is continuously converted into the rotating force of the hands. Therefore, it is almost impossible to incorporate it into a micro-sized device of the size of a wristwatch, for example, because of the capacity limitation of a micro-sized battery as a built-in power supply.

On the other hand, as another conventional example, a physical quantity is converted into a drive signal of a number proportional to this, a step motor is driven by the signal, the rotation of the output shaft of the step motor is reduced by a gear train, and the speed of the gear train is reduced. Attach the pointer to the shaft of one of the gears,
There is an instrument for displaying the physical quantity according to the pointer. The drive of the step motor only needs to supply power instantaneously when the instruction changes, and the physical quantity can be sampled at arbitrary time intervals and held in a digital circuit, which is extremely advantageous in terms of power consumption. Some step motors are extremely miniaturized and pursue high power efficiency. The most popular instrument of this type is a quartz electronic wristwatch, which displays time as a physical quantity. There is also a proposal (Japanese Utility Model Application Laid-Open No. 61-28019) for displaying a physical quantity other than the time using the pointer display function. However, in the related art, since the rotation of the hands is presumed to be performed indefinitely, a circular display area is required.

As another conventional example, there is a proposal (Japanese Utility Model Publication No. Sho 63-17030) for displaying time information within a fan-shaped angle region using a pointer driven by a step motor. in this case,
When the time reaches the full display range, the hands also reach the end of the display area at the same time, and when the time further advances, the hands must naturally return to the opposite end of the display area with a quick movement. The drive signal of the step motor for performing this operation is created by an electronic circuit that performs a logical operation. Once the pointers are attached to the electronically controlled pointer driving mechanism in the correct relationship, the phase between the electronic logic operation and the pointer position is thereafter determined as far as time information, etc., at which regular and repetitive changes are made. We can expect that the relationship will not go wrong first. However, efficient methods or means for mounting the hands in the correct position (orientation) in accordance with the logic state of the electronic circuit have not been provided hitherto, especially when the range of movement of the hands is mechanically limited. This synchronization is a necessary operation regardless of the physical quantity to be measured, and an efficient synchronization means is indispensable for mass-producing a device having a sector display function by a step motor. In addition, it is highly desirable to have a function of correcting a deviation of the scale from the pointer after the mounting when the product has a fan-shaped display, but such a proposal has not yet been made.

Further, when the physical quantity to be measured and displayed is not always within a predetermined display range (for example, in the case of temperature or pressure) and the movable range of the pointer is limited. Other problems arise. The reason is described below.

In an instrument adopting a method in which a physical quantity is converted into a drive signal of a number proportional to it and a pointer is sent by a step motor, the absolute value of the physical quantity is not converted and displayed as a pointer position as it is (every time measurement sampling is performed). A method of returning the pointer to the reference position is also possible, but it is not preferable because it is inferior to the change of the measured value), but if it changes every moment, the step motor is moved forward or backward by the difference between the previous measured value and the new measured value. The signal of the step motor is added so that the signal is sent in the reverse direction. (Note that an example of a method of arbitrarily rotating the step motor forward or backward is disclosed in US Pat. No. 4,112,6.
(Disclosed in No. 71) Therefore, after the pointer or its associated member stops against a stopper or an obstacle outside the measurement angle range of the pointer and stops, and then a signal corresponding to the scale-out is added. In addition, the step motor must stop as it is even when the drive current flows. Further, when the physical quantity returns to the normal measurable range in the next sampling, a signal for driving the pointer by the difference between the previous (scaled out) measured value and the present measured value is applied to the step motor. However, since the pointer is not at its original position due to the action of the stopper as described above and is displaced from the position where it hit the stopper, the stop position does not correspond to the correct measurement value and points to the wrong position become.

A step motor having a well-known structure which is very commonly used in analog quartz wristwatches (a single coil and a disk-shaped permanent magnet magnetized so as to produce two poles at both ends of the diameter) is used. The use of a rotor having a rotor and a pair of yokes sandwiching the rotor from both sides, each of which is magnetically connected to the end of a coil core.) It is necessary to give a pulse, and if it is not driven with the correct polarity, the movement of the pointer does not occur, resulting in a miscount. When the pointer is blocked by the stopper and stops, the step motor is swung. If the number of drive signals for the scale over mentioned above is an even number, the pointer immediately follows the first return pulse and performs a return operation. If the number of drive signals is an odd number, the pointer may not follow the first return pulse, which also contributes to a miscount that causes the pointer position to be misunderstood.

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems. (1) Generally, when the moving range of the pointer is limited, the pointer can be correctly mounted efficiently, or the position of the pointer once mounted can be efficiently adjusted. (2) The stepper motor is driven by a stepping motor, and the pointer is displayed in a limited area, further comprising means for preventing a possible displacement of the pointer depending on the type of the physical quantity to be measured. It is intended to provide an apparatus for performing the above.

That is, according to the present invention, the circuit means for continuously driving the stepper motor in one direction at least by the number of steps corresponding to the movable range of the pointer when desired (1) is provided. A pointer display device which facilitates the mounting of the pointer by providing a circuit means capable of performing the operation may be provided. Regarding the above (2), generation of a step motor drive signal corresponding to a physical quantity exceeding the display range is prohibited. It is a pointer display device further provided with circuit means.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an external appearance of an electronic timepiece with a pointer display type calendar according to a first embodiment of the present invention, and FIG. 2 is a plan view of a module (movement) of the embodiment viewed from the dial side. FIG. 3, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, FIG. 4 (a) and FIG. 4 (b) are plan operation diagrams of the day fan-shaped display unit of the embodiment, and FIG. FIG. 6B is a partial plan view showing a modification of the stopper mechanism of the day fan display unit in the embodiment, FIG. 6B is a cross-sectional view thereof, and FIGS. 6A and 6B are blocks of an electro-mechanical circuit of the embodiment. FIG. 7 is a block diagram of an electro-mechanical circuit of an electronic timepiece with a temperature measuring function according to a second embodiment of the present invention, and FIG. 8 is a diagram of a sensor circuit and an A / D conversion circuit as a part thereof. FIG. 3 is a detailed block diagram.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

First Embodiment This embodiment is a wristwatch having the appearance as shown in FIG. 1, and has a pointer display which moves in a fan-shaped range as a part of the display. The physical quantity displayed by the sector pointer display unit is time information, which is one of the weekday information of a calendar.

[Explanation of Mechanical Section of First Embodiment] In FIG. 1, an hour hand 10a and a minute hand 10 for displaying a normal time are shown.
b, second hand 10c, and 24-hour display hand 10d that rotates once in 24 hours
Displays the current time by moving the hand in steps of 1 second (1 Hz) in the same manner as an ordinary three-hand electronic timepiece with a hand. Reference numeral 11 denotes a dial, and in addition to a time display scale and a date display scale, a day of the week display section 11a is a clockwise clockwise Sunday 111 from the upper left.
The scale from July to Saturday 112 is engraved in a fan shape.

Reference numeral 12 denotes a date hand for displaying the date of the calendar, which moves one day in one step and makes one rotation in 31 days.

Reference numeral 13 denotes a day hand indicating the day of the calendar, and Sunday 11
From 1 to Saturday 112, the hand moves on one day in one step and reaches the position of Saturday 112 in six steps.

To switch from Saturday 112 to Sunday 111, rotate counterclockwise.
The above 6 steps are instantaneous (approximately 0.2 seconds) at 32Hz fast forward.
The day hand 13 performs a reciprocating fan-like rotation of one reciprocation in one week. Date hand 12, Day hand 13, Calendar switch 227 (to be described later) (hereinafter abbreviated as S4 switch)
In this system, each day is advanced by electrical control using a switch signal that is input once in 24 hours.

Reference numeral 14 denotes a crown, which is an external operation member. The crown 14 is rotated left and right in a two-step pulling state 142, so that the time of the hour hand 10a, the minute hand 10b, and the 24-hour display hand 10d can be adjusted in the same manner as a normal hand-held electronic timepiece. When the crown 14 is pulled to the second stage 142, a well-known reset switch 229 (hereinafter abbreviated as S6 switch) is engaged, and the second hand 10c stops at an arbitrary position. Crown 1
In the single-step pulling state 141 of FIG. 4, the hand 12 and the day hand 13 are moved by electric control to enter a hand position correcting mode for correcting the hand position, and a hand position correcting switch 228 (hereinafter abbreviated as S5 switch). Is turned on.

Reference numeral 15a denotes a push button (hereinafter abbreviated as PB1 button) for correcting the hand position, if any, of the day hand 13 already attached to the shaft by electric control, and operates the PB1 button. Day hand correction switch 2
21 (hereinafter abbreviated as S1 switch) is turned on. 15b is PB1
Like the button 15a, it is a hand position correcting push button (hereinafter abbreviated as PB2 button) for the date hand 12, and a date hand correcting switch 222 (hereinafter abbreviated as S2 switch) is turned on. The PB2
When the button 15b is pressed (shortened) for a short time, the date hand 1
When step 2 is advanced by one step and a push operation (zooming operation) is performed for a long time (for example, 2 seconds), the date hand 12 is driven in a clockwise direction by a fast-forward movement of 32 Hz.

15c is a mode setting button (hereinafter abbreviated as PB3 button) for attaching the day hand 13 in the crown two-stage pulling state 142.
By pressing the PB3 button, the day hand set switch 223 (hereinafter abbreviated as S3 switch) is turned on.

2 and 3, 201 is the main plate, 202 is the underlay,
301 is a train wheel receiver, and 21 is a battery as a power supply.

Reference numeral 22 denotes a circuit block, and a crystal oscillator 225 is mounted on a circuit board 224 on which a side pattern serving as a fixed-side contact of the S1 switch 221, the S2 switch 222, the S3 switch 223, and the like, and a conductive pattern for electrically connecting electronic elements are wired. , An IC chip 226 and the like.

Reference numerals 231 and 232 denote switch springs [I] and [II] constituting the S1, S2 and S3 switches 221, 222 and 223, respectively.
1, each of the movable contact portions 223a, 231a of the switch springs [I], [II] in conjunction with the pressing operation of the PB2, PB3 buttons 15a, 15b, 15c,
The switch operation is performed by the 232b being pressed against the side surface of the circuit board 224 or the side surface pattern portion arranged in the through hole.

The mechanism of the S5 and S6 switches 228 and 229 that perform a switch operation in conjunction with the pulling operation of the crown 14 engages with the mandrel pin 241a integrated with the mandrel 241 that is a component of the well-known external operation switching mechanism 24. Then, the tip 243a of the reset lever 243 that operates around the rotation shaft 242 slides while being pressed against the circuit board 224, and comes into contact with the S5 and S6 switches 228 and 229 patterns wired on the circuit board 224. Switch operation.

Reference numeral 251 denotes a step motor A (hereinafter, abbreviated as motor A) which is an electromechanical converter that drives the normal time display wheel train 261. Step motors B and C 252 and 253 drive the date wheel train 262 and day wheel train 263, respectively. Hereinafter, these are abbreviated as motor B and motor C).

The normal time display train wheel 261 receives a rotating force from the rotor A251a constituting the motor A251, and
→ 4th wheel 261b (second hand 10c device) → 3rd wheel 261c → Central wheel 261
d → 2nd intermediate car [II] 261e → 2nd intermediate car [I] 261f → 2
Second wheel 261g (with minute hand 10b) → minute wheel [I] 261h → hour wheel 2
The wheel train structure drives the 61i (with the hour hand 10a).

The structure of the above-described S4 switch 227 is different from that of the second intermediate wheel [II] 261e, which is press-fitted and fixed to the center wheel 261d, from the intermediate switch wheel 261k
The rotation is transmitted to the switch wheel 261l which makes one rotation in 24 hours through the switch, and the switch spring 261m which rotates in conjunction with the switch wheel 261l pushes the switch terminal 261p which is electrically connected to the switch pattern wired on the circuit board 224. The switch operation is performed by the contact. In addition, 24-hour display hand
10d is the central wheel 261 via the switch intermediate wheel 261k.
It is mounted on the second hour wheel 261n arranged coaxially with d.

The date wheel train 262 has a wheel train structure that transmits a rotational force from a rotor B252a constituting the motor B252 to a date wheel 252c on which the date hand 12 is mounted via a date intermediate wheel 252b.

The day wheel train 263 is a middle day wheel [II] 253b and a middle day wheel [I] 253c from the rotor C253a constituting the motor C253.
, The rotational force is transmitted to a day wheel 253d to which the day hand 13 is attached via a wheel train.

The day wheel 253d is composed of two parts, a day gear 253e made of synthetic resin and a day wheel 253f.
253g of stopper dowels are formed on the gear surface of. The stopper dowel 253g is formed by an arc-shaped long hole 201 provided in the main plate 201.
Together with both ends 201b and 201c of a, a stopper for restricting rotation of the day indicator 253d is formed.

Next, the rotation operation and the day display of the day indicator 253a viewed from the dial side in FIG. 4 will be described. The operation of the circuit blocks such as the switch control circuit and the pointer control circuit will be described later.

After assembling the module parts, in the module completed state in which the battery 21 as a power supply is incorporated, since the circuit block 22 is in an all-reset state by electrical control, the drive signals to the motors 251, 252, and 253 are output. It is stopped. Then, turn crown 14 to two-step pull 142 and rotate
After the switch 229 is turned on, the PB3 button 15c is pressed once to turn on the S3 switch, the all reset of the circuit block 22 is released, and the operation starts. Then
The reverse rotation drive signal of rotor C253a is
The 18-step number is output at a fast-forward speed of 2 Hz, and the day wheel 253d rotates counterclockwise via the day wheel train 236. The long hole 201a for the stopper provided on the main plate 201 has a long hole shape that can drive up to 17 steps when the driving rotation speed of the rotor C253a is converted into the number of driving steps of the dowel 253g for the stopper of the day wheel 253d. The dowel 253g reaches the position P1 on the right side of the stopper wall 201c of the main plate 201 from the position P18 on the right side of the stopper wall 201c at any position (P1 to P18) in the long hole 201a for the stopper. Further, the rotation block 22 outputs a forward rotation drive signal of the rotor C253a in the form of 9 steps at a fast forward speed of 32 Hz.
The 253d rotates clockwise, and the dowel 253g for the stopper
Stop at P10.

The above operation of the day indicator 253d is performed after 1
This operation is performed continuously within seconds.

Next, while maintaining the stopped state of the day wheel 253d, the dial
11, while wearing each pointer 10a, 10b, 10c, 10d, 12
Attach the day hand 13 to the position of Saturday 112. here,
The relative position of the stopper dowel 253g and the day hand 13 will be linked for the first time.

Next, an initial setting method of the pointer control circuit of the circuit block 22 and the day hand 13 will be described.

The crown 14 keeps the two-step pulling state 142 and the PB1 button 15
When a is pressed once, the motor drive signal in the counterclockwise rotation direction of the rotor C253a is output from the circuit block 22 with 8 steps at a fast forward speed of 32 Hz, and the stopper dowel 253g is set to P1.
It moves with the rotation of the day wheel 253d from the 0 position to the P2 position.

In the first and subsequent pressing operations of the PB1 button 15a, the day wheel 253d rotates clockwise by one step at a maximum of four steps (the position of Tuesday 113) for each pressing operation, and in the next one pressing operation, the day wheel 253d is rotated. The PB1 button 15a is used to repeat the fan-shaped drive, which returns four steps in a 32Hz fast-forward direction in the counterclockwise direction.
To the position of Sunday 111 which is the initial set position.

The initial set mode can be canceled by pressing the S6 switch 22
9 is turned off, that is, the crown 14 is released when the crown 14 is returned to a position other than the two-step pull 142, the initial set position of the day hand 13 matches the pointer control circuit, and the day hand 13 is driven by electric control.

Next, the operation of the day indicator 253d when the date hand 12 and the day hand 13 are adjusted to the current calendar will be described.

Turn crown 14 to 1-step pull-down state 141 and turn on S5 switch
Press the PB2 button 15b for a short or long time
ZO) Set the date hand 12 by pressing. Day hand 13 is PB
Each time the 1 button 15a is pressed once, the clockwise rotation advances by one day, moves from Sunday 111 to Saturday 112 by the sixth pressing operation, and returns six steps in the counterclockwise rotation at a fast forward speed of 32 Hz by the seventh pressing operation. The current day of the week is set by repeating the sector drive.

In addition, in the area of P11 to P18 provided outside the stopper dowel 253g operating range of the day indicator 253d, the user usually carried the initial hand position of the day hand 13 intentionally set to the wrong position such as Tuesday 113 or the like. In this case, consideration is made so that there is no problem even if the day hand shifts in position (operation of rotating the day wheel 253d to the rotor C253a) due to an excessive disturbance such as an impact.

5A and 5B show a modification of the stopper mechanism of the day indicator, FIG. 5A is a plan view of a main part thereof, and FIG. 5B is a sectional view of the main part.

The day wheel 51 includes a day wheel 511 and a day wheel truth 512 made of synthetic resin. The day gear 511 is integrally formed with a projection 511c which is formed by projecting a part of the tooth profile 511a from the tooth tip outer diameter 511b in a plane. When the day wheel 51 rotates along with the rotation of the day intermediate wheel 52, the end surface 511d of the protrusion 511c is
And the rotation is restricted by interfering with the tooth tip 52a of the nose.

When the day intermediate wheel 52 is driven in reverse rotation, the end surface 511 of the day gear 511 on the opposite side to the end surface 511d of the projection 511c.
e interferes with the tooth tip 52a of the day intermediate wheel 52 and regulates the rotation of the day wheel 51.

[Explanation of the Circuit Section of the First Embodiment] The circuit configuration and the operation of the electro-mechanical system are shown by the block diagram of FIG. 6 (divided into FIG. 6 (a) and FIG. 6 (b)). explain.

601 is a time reference source, and a time reference signal P ₆₀₁ (32768H
z) occurs.

602 is a divider circuit, wherein a frequency dividing signal of the time reference source from 601 time reference signal signal group and 32Hz of P ₆₀₁ plural stages of frequency dividers than become divided signal P ₆₀₂ which receives the 32Hz signal P
Outputs ₆₉₉ .

610 is a switch circuit, and 221 (the above-described S1 switch: P
B1 button 15a), 222 (S2 switch: PB2 button 15b), 223 (S3 switch: PB3 button 15c)
6) of 227 (S4 switch described above: linked to switch wheel 261), 228 (S5 switch described above linked to crown pulling), and 229 (S6 switch described above linked to crown pulling) Switches, each switch having a respective anti-chattering circuit 611, 612, 613, 61
Day hand correction signal P ₆₁₁ , day hand correction signal P via 7, 618, 619
₆₁₂ , initial set signal P ₆₁₃ , calendar feed signal P ₆₁₇ ,
It outputs a calendar mode signal _P618 and a reset signal _P619 .

The switch circuit 610 has INVs 614, 615 and 616. The INV 616 receives the reset signal P ₆₁₉ and outputs a reset inverted signal P ₆₁₆ which is an inverted signal.
_Receives the calendar mode signal _P618 , outputs a calendar mode inversion signal _P615 , which is an inverted signal,
V614 outputs an initial set inverted signal P ₆₁₄ is an inverted signal as an input the initial set signal P _613.

The time signal generation circuit 603 receives the predetermined frequency division signal P 602 from the frequency division circuit ₆₀₂ and the reset inversion signal P ₆₁₆ from the switch circuit 610, and the reset inversion signal P ₆₁₆ becomes “H”.
When the crown 14 of the level shown in FIG. 1 is pulled out to the zero-step position or the one-step pull state (FIG. 141), a time signal P ₆₀₃ which is a one-second cycle for time driving is output.

Reference numeral 604 denotes time hand driving means, which is constituted by a time hand driving circuit 605 and a motor A251 (see FIG. 2). The time hand drive circuit 605 receives the time signal P ₆₀₃ and outputs a time hand drive signal P ₆₀₅ from an output terminal. The time hand drive signal
P ₆₀₅ is supplied to the motor 606 to
The time train wheel and the hands 607 are operated in conjunction with. That is, the second hand 10c (see FIG. 1) is driven to mechanically interlock with the second hand 10c. The minute hand 10b, the hour hand 10a, and the 24-hour display hand 10d.
The time is displayed together with.

Reference numeral 620 denotes date display means, which includes a date feed signal generation circuit 621, a date hand electromagnetic correction circuit 622, and a three-input AND gate 623 (hereinafter referred to as AND6).
23) It is composed of a two-input AND gate 624 (hereinafter, AND624) and a two-input OR gate 625 (hereinafter, OR625).

The switch circuit 61 is connected to a first input terminal of the AND 623.
A reset inversion signal P ₆₁₆ from 0 is input, a calendar mode inversion signal P ₆₁₅ from the switch circuit 610 is input to a second input terminal, and a calendar feed from the switch circuit 610 is input to a third input terminal. Signal P ₆₁₇ is input.

The date feed signal generating circuit 621 receives the predetermined frequency-divided signal P ₆₀₂ from the frequency-dividing circuit ₆₀₂ and the output signal from the AND 623 as inputs, and sets the reset inversion signal P ₆₁₆ and the calendar mode inversion signal P ₆₁₅ to “H”. At the time of the level, that is, when the crown 14 in FIG. 1 is pushed into the 0-step position, the above mode always follows the timing of the calendar feed signal _P617.
A day feed signal P ₆₂₁ for a day feed drive having a 24-hour cycle is output.

The switch circuit 61 is connected to one input terminal of the AND624.
The calendar mode signal P ₆₁₈ from 0 is input, and the other input terminal receives the date hand correction signal P from the switch circuit 610.
₆₁₂ is input.

The date hand electromagnetic correction circuit 622 receives a predetermined divided signal P ₆₀₂ from the frequency dividing circuit ₆₀₂ and an output signal from the AND 624 as inputs, and when the calendar mode signal P ₆₁₈ is at “H” level, that is, the first When the crown 14 in the figure is pulled to the one-step pulling state 141, the date hand correction signal for electromagnetic correction is operated according to the operation of the PB2 button 15b used as a button for date correction.
Outputs _P622 .

One input terminal of the OR 625 is connected to the date feed signal P _621.
Is input, and the other input terminal has the date hand correction signal
_P622 is input, and a date display signal _P625 is output from the output terminal.

Reference numeral 626 denotes date hand driving means, which includes a date hand driving circuit 627 and a motor B252.

The date hand drive circuit 627 receives the date display signal P ₆₂₅ from the date display means 620 and outputs a date hand drive signal P ₆₂₇ from an output terminal. The date hand drive signal P ₆₂₇ is supplied to the motor B252 (see FIG. 2), so that the date wheel train and hands 629 operate. That is, the date hand 12 is driven to display the date.

Next, an initialization drive signal generation circuit according to the present invention will be described. In this embodiment, this circuit includes a day wheel train initial control circuit 630 or a day hand initialization control circuit 640 described below and a day signal generating means 680 cooperating therewith, and the like. It is a circuit means for achieving an operation function.

Reference numeral 630 denotes a day wheel train initial control circuit for performing control for initializing a wheel train for the day hand for performing a sector display, and includes a D type flip-flop circuit (hereinafter, referred to as D-FF) 631, 635, and 2,
It comprises input AND gates (hereinafter referred to as AND) 632 and 636, an 18-digit counter 633, a 9-digit counter 637, an 18-shot detection circuit 634, and a 9-shot detection circuit 638.

An input terminal D of the D-FF 631 receives a reset signal P ₆₁₉ from the switch circuit 610, an input terminal CL receives an initial set inversion signal P ₆₁₄ from the switch circuit 610,
The input terminal R receives an 18-shot detection signal P ₆₃₄ from an 18-shot detection circuit 634 described later. Then, from the output terminal Q of the D-FF 631, the PB3 button 15c is operated with the two-step pulling state 142 of the crown 14 in FIG. 1, that is, the S6 switch 229 is ON, that is, to initialize the wheel train for the day hand. Is performed, the day wheel train reverse rotation permission signal P ₆₃₁ for controlling to fast-forward the wheel train for the day hand in the reverse direction is output first. (See below
This is reset by outputting the 18-shot detection signal P _634. ) One of the input terminals of the AND 632 receives the 32 Hz signal P ₆₉₉ from the frequency dividing circuit 602, and the other input terminal has the day ring. Since the column inversion enable signal P ₆₃₁ has been input, when the day train inversion enable signal P ₆₃₁ is at “H” level from the output terminal
32Hz signal P ₆₉₉ is output 18 rounds as曜初life reverse rotation control signal P _632.

The input terminal I of the 18-digit counter 633 receives the day initial reverse control signal P ₆₃₂ , the input terminal R receives the initial set signal P ₆₁₃ from the switch circuit 610, and the above-described wheel train for the day hand. Hexadecimal counter in the operation to initialize
633 Once the initial reverse control signal P ₆₃₂ after reset 18
When counting is started, an 18-ary carry signal _P633 is output from the output terminal Q.

An input terminal I of the 18-shot detection circuit 634 receives the 18-digit carry signal P ₆₃₃ as an input, and an input terminal R is connected to the switch circuit 61.
When the initial set signal P ₆₁₃ is input from 0 and the 18-ary carry signal P ₆₃₃ is output, an 18-shot detection signal is output from the output terminal Q.
Outputs P ₆₃₄ .

The input terminal D of the D-FF 635 is an input of the reset signal P ₆₁₉ from the switch circuit 610, the input terminal CL is an input of the 18-shot detection signal P ₆₃₄ from the 18-shot detection circuit 634, and the input terminal R is 9 to be described later. 9 shot detection signal P ₆₃₈ from the shot detection circuit ₆₃₈
Is input. Eventually, from Q, the operation for initializing the wheel train for the day hand described above causes the wheel train for the day hand to turn in the reverse direction.
After the 18-shot operation is performed and the 18-shot detection signal P ₆₃₄ is output, a day wheel train normal rotation permission signal P ₆₃₅ for performing control to quickly feed the wheel train for the day hand to the next normal rotation direction is output. The reset is performed when a 9-first detection signal P ₆₃₈ described later is output.

One of the input terminals of the AND 636 is connected to the 3
The 2 Hz signal P ₆₉₉ is input, the day train reverse rotation permission signal P ₆₃₅ is input to the other input terminal, and the 32 Hz signal P is output when the day train normal rotation permission signal P ₆₃₅ is at “H” level from the output terminal. ₆₉₉ is outputted 9 shots as曜初life forward control signal P _636.

The input terminal I of the ninth-counter counter 637 receives the initial day rotation control signal P ₆₃₆ , and the input terminal R receives the initial set signal P ₆₁₃ from the switch circuit 610. Nin decimal counter in operation to initialize a column
638 outputs the曜初life forward control signal P ₆₃₆ 9 binary from 9 rounds counting and the output terminal Q carry signals P ₆₃₇ once after reset.

The input terminal K of the nine-shot detection circuit 638 receives the ninth carry signal P ₆₃₇ as an input, and the input terminal R is connected to the switch circuit 61.
When the initial set signal P ₆₁₃ from 0 is input and the 9-ary carry signal P ₆₃₇ is output, a 9-shot detection signal P ₆₃₈ is output from the output terminal Q.

Reference numeral 640 denotes a day hand initialization control circuit for controlling an operation for initializing the day hand 13 to the zero position. D-type flip-flop circuits 642 and 648 (hereinafter D-FF), two-input AND gates 641 and 643 , 650, 651 (hereinafter AND) and three-input AND gate 647, 649 (hereinafter AND), IN
It comprises V646, INV655, octal counter 644, eight-shot detection circuit 645, up / down counter 652 (hereinafter UD counter), four detection circuits 653, and zero detection circuit 654.

One input terminal of AND641 is connected to the nine-shot detection circuit 638.
, A nine-shot detection signal P ₆₃₈ is input, and an output signal from an INV 646 described later is input to the other input terminal. Then, after the operation for initializing the wheel train for the day hand described above, IN
Since the output signal of the V646 is at the "H" level, after the train wheel for the day hand is initialized, that is, 18 operations are performed in the reverse direction and then 9 operations are performed in the forward direction, and the 9-speed detection signal is output. the output signal of AND641 the P ₆₃₈ is output becomes "H" level.

The input terminal D of the D-FF 642 receives the output signal of the AND 641, the input terminal CL receives the day hand correction signal P ₆₁₁ from the switch circuit 610, and the input terminal R receives the signal from the eight-shot detection circuit 645 described later. An eight-shot detection signal P ₆₄₅ is input. Then, after the train wheel for the day hand has been initialized from the output terminal Q of the D-FF645 as described above, the PB1 button 15a is further pressed while the crown 14 in FIG. Based on the pressing operation, a day hand reverse movement permission signal P ₆₄₂ for performing control to reversely move from the “Saturday” position where the day hand 13 is attached to the “Sunday” position which is the initialization position is output. . The D-FF ₆₄₅ is reset when an eight-shot detection signal P ₆₄₅ described later is output.

One input terminal of the AND 643 is connected to the 3
The 2 Hz signal P ₆₉₉ is input, the day hand reverse movement permission signal P ₆₄₂ is input to the other input terminal, and the 32 Hz signal P ₆₉₉ is output when the day hand reverse movement permission signal P ₆₄₂ is at “H” level from the output terminal. Is output as the day hand reverse movement permission signal P ₆₄₃ .

The input terminal I of the octal counter 644 receives the day hand reverse movement control signal P ₆₄₃ , and the input terminal R receives the initial set signal P ₆₁₃ from the switch circuit 610. Octal counter in operation to initialize a column
After the 644 is reset once, when the day hand reverse movement control signal P ₆₄₃ is counted eight times, an octal carry signal P ₆₄₄ is output from the output terminal Q.

An input terminal K of the 8-shot detection circuit 645 receives the octal carry signal P ₆₄₄ as an input, and an input terminal R is connected to the switch circuit 61.
When the initial set signal P ₆₁₃ from 0 is input and the octal carry signal P ₆₄₄ is output, an eight-shot detection signal P ₆₄₅ is output from the output terminal Q.

The first input terminal of the AND 649 receives the 8-shot detection signal P ₆₄₅ , the second input terminal receives the day hand correction signal P ₆₁₁ from the switch circuit 610, and the third input terminal receives a switch. The reset signal P ₆₁₉ from the circuit 610 is input.

One input terminal of AND650 has 4
The detection inversion signal P ₆₅₅ is input, and the output signal of the AND 649 is input to the other input terminal.

That is, after the above-described operation of moving the crown 14 toward the initializing position in the reverse direction, the crown 14 remains in the two-step position and the PB1
When the button 15a is pressed, the day hand correction signal P ₆₁₁ is output as an output signal of the AND 649, and the 4 detection inversion signal P ₆₅₅ is set to "H".
Day hand initial forward rotation control signal P that controls the day hand correction signal P ₆₁₁ to initialize the day hand 13 at the level.
Output as ₆₅₀ .

The first input terminal of AND647 has a four-detection circuit 653 to be described later.
Fourth detection signal P ₆₅₃ is inputted from the reset signal P ₆₁₉ from the switching circuit 610 is inputted to the second input terminal,
The eight-shot detection signal P ₆₄₅ is input to a third input terminal.

After the crown 14 is moved in the reverse direction toward the above-described initialization position, when the crown 14 is in the two-stage position state and the four detection signal P ₆₅₃ from the four detection circuit 653 described later is at the “H” level, the AND
The output signal of 647 is at "H" level.

The input terminal D of the D-FF 648 receives the output signal of the AND 647 as an input, the input terminal 7CL receives the day hand correction signal P ₆₁₁ from the switch circuit 610, and the input terminal R receives the signal from the 0 detection circuit 654 described later. The 0 detection signal P ₆₅₄ is input. Then, when the PB1 button 15a is pressed from the output terminal Q with the AND647 at the "H" level and the crown 14 is in the second position, the day hand initial reverse rotation permission signal P ₆₄₈ for performing control to initialize the day hand 14 is set. Is output and reset by a 0 detection signal P ₆₅₄ described later.

One input terminal of the AND 651 is connected to the 3
The 2 Hz signal P ₆₉₉ is input, the day hand initial reverse rotation enable signal P ₆₄₈ is input to the other input terminal, and the 32 Hz signal P is output when the day hand initial reverse enable signal P ₆₄₈ is at “H” level from the output terminal.
₆₉₉ is output as the day hand initial reverse control signal P _651.

The U counter 652 is a quinary up / down counter whose count value corresponds to the position of the day hand 14 when the initialization is set, and counts up according to a signal to the input terminal UP.
It counts down according to the signal of the input terminal DOWN, and the count value is reset to “0” by the “H” level signal to the input terminal R. The input terminal UP of the UD counter 652 receives the day hand initial forward rotation control signal P ₆₅₀ , the input terminal DOWN receives the day hand initial reverse rotation control signal P ₆₅₁ , and the input terminal R receives the switch circuit 610. , An initial set signal P ₆₁₃ is output from the output terminal Q, and a day initialization count signal P _652, which is a signal group of count values corresponding to the position of the day hand 14 when initialization is set, is output.

4 detection circuit 653 is the day initialization count signal P ₆₅₂
When the UD counter 652 counts up and detects that the count value has become “4”, a 4 detection signal
P ₆₅₃ is output, and is always output while the count value is “4”.

The 0 detection circuit 654 receives the day initialization count signal P ₆₅₂ as an input, and when the UD counter 652 counts down and detects that the count value becomes “0”, the 0 detection signal P _654.
Is output, and is always output while the count value is “0”.

The input terminal of INV655 receives the four detection signal P ₆₅₃ as input and outputs a four detection inverted signal P _{655 which} is an inverted signal.

Reference numeral 660 denotes a day hand normal control circuit that performs day feed control once a day in the normal use state of the day hand 13 and day adjustment control to set the current “day” in the calendar setting state.
Type-flip-flop circuits 662 and 664 (hereinafter DF)
F) 2-input AND gate 661, 663, 667, 669, 670, 3
Input AND gate 666 (hereinafter AND), INV674 (hereinafter AN)
D), input OR gates 665 and 668 (hereinafter OR) up-down counter 671 (hereinafter UD counter), 6-detection circuit 672, and 0-detection circuit 673.

A first input terminal of AND661 has a 6-detection circuit 672 described later.
6 detection signal P ₆₆₂ is inputted from the calendar mode inversion signal P ₆₁₅ from the second input terminal switching circuit 610
The reset inversion signal P ₆₁₆ from the switch circuit 610 is input to the third input terminal.
Detection signal P ₆₇₂ is H level, that is, when the day hand 13 is located at the position of "Saturday", the output signal of AND661 is at the "H" level.

The input terminal D of the D-FF 662 receives the output signal of the AND 661, the input terminal CL receives the calendar feed signal P ₆₁₇ from the switch circuit 610, and the input terminal R receives the 0 signal from the 0 detection circuit 673 described later. The detection signal P ₆₇₃ is input.

When the AND 661 is at the “H” level, the D-FF 66
2 is based on the fact that the change That calendar feed signal P ₆₁₆ from the output terminal Q from the CL terminal "L" level to the "H" level is outputted, "Sunday" the day hand 13 from the "Saturday" in normal use Day hand normal reverse permission signal P ₆₆₂
Is output.

One input terminal of the AND663 has a 6-detection circuit 672 described later.
6 detection signal P ₆₇₂ is inputted from the calendar mode signal P ₆₁₈ from the switch circuit 610 to the other input terminal
When the crown 14 is in the calendar setting state at the first position and the 6 detection signal P ₆₇₂ from the 6 detection circuit 672 described later is at the “H” level, that is, when the day hand 13 is at the “Saturday” position,
The output signal of AND663 is at "H" level.

The input terminal D of the D-FF 664 receives the output signal of the AND663 as input, the input terminal CL receives the day hand correction signal P ₆₁₁ from the switch circuit 610, and the input terminal R receives from the 0 detection circuit 673 (described later). The 0 detection signal P ₆₇₃ is input.

When the AND663 is at the "H" level, the D-FF66
4 is the day hand in the calendar setting state based on the change of the output terminal Q from the CL terminal from the “L” level to the “H” level, ie, the operation of pressing the PB1 button 15a when the crown 14 in FIG. It outputs the day hand setting reverse rotation permission signal P ₆₆₄ for controlling to send 13 in reverse from “Saturday” to “Sunday”.

One of the input terminals of the OR 665 receives the day hand normal reversal permission signal P ₆₆₂ , the other input terminal receives the day hand setting reversal permission signal P ₆₄₄ , and the logic of the two permission signals is output from the output terminal. The day hand normal reverse rotation permission signal P ₆₆₅ which is the sum is output.

The one-input terminal of the AND 670 receives the day hand normal reversal permission signal P ₆₆₅ , the other input terminal receives the 32 Hz signal P ₆₉₉ from the frequency dividing circuit 602, and the output terminal provides the day hand normal When the reverse rotation permission signal P ₆₆₅ is at the “H” level, the 32 Hz signal P ₆₉₉ is output as the day hand normal reverse control signal P ₆₇₀ .

The calendar input signal P ₆₁₇ from the switch circuit 610 is input to the first input terminal of the AND 666, and the input to the second and third input terminals is the same as that of the AND 661. In use, the calendar feed signal P ₆₁₆
Is output, the calendar feed signal P ₆₁₆ is output from the output terminal of the AND ₆₆₆ as the day hand normal rotation control signal P ₆₆₆ .

One input terminal of AND667 receives the day hand correction signal P ₆₁₁ from the switch circuit 610, the other input terminal receives the calendar mode signal P ₆₁₈ from the switch circuit 610, and the crown 14 is in the first position. the day hand correction signal P ₆₁₁ from the output terminal of the calendar set condition when PB1 button 15a of FIG. 1 is pressed AND667 of is output as a day hand set forward control signal P _667.

The day hand normal forward control signal P ₆₆₆ is input to one input terminal of OR668, the day hand setting forward control signal P ₆₆₇ is input to the other input terminal, and two control signals are output from the output terminals. Is output.

One input terminal of AND669 is connected to INV674 (described later).
Detection inverted signal P ₆₇₄ is input, an output signal of the OR669 is inputted to the other input terminal, 6 detection inverted signal P ₆₇₄
There "H" level, that the day hand 13 is the day hand normal forward control signal P ₆₆₆ or said day hand set forward control signal P ₆₆₇ is the day hand normal from the output terminal of the output AND669 when other than "Sunday" This signal is output as the forward rotation control signal _P669 .

The U / D counter 671 is a 7-digit up / down counter whose count value corresponds to the position of the day hand 13 ("Sunday" to "Saturday"), and counts up according to a signal to the input terminal UP. Count down according to the signal to DOWN,
The count value is reset to “0” by the “H” level signal to the input terminal R.

The day hand normal normal rotation control signal P ₆₆₉ is input to an input terminal UP of the U / D counter 671, the day hand normal reverse control signal P ₆₇₀ is input to an input terminal DOWN, and the switch is input to an input terminal R. The reset P ₆₁₉ from the circuit 1 is input, and a day hand position counting signal P _671, which is a signal group of the day hand position count value, is output from the output terminal Q.

The 6-detection circuit 672 receives the day hand position counting signal P ₆₇₁ as an input, and when the U / D counter 671 detects that the count value has reached “0”, the 6-detection signal P ₆₇₂ is output.
And is always output while the count value is “6”.

The 0 detection circuit 673 receives the day hand position counting signal P ₆₇₁ as an input,
When the U / D counter 671 counts down and detects that the count value has become "0", it outputs a 0 detection signal _P95, which is always output while the count value is "0".

The sixth detection signal P ₆₇₂ is an input inverted signal of 6 detection inverted signal P ₆₇₄ is outputted to the input terminal of INV674.

Reference numeral 680 denotes a day signal generation means, and a day forward signal generation circuit 68
1, a day inversion signal generating circuit 682, a two-input OR gate 685 (hereinafter OR), a three-input OR gate 683 (hereinafter OR), and a four-input OR gate (hereinafter OR).

The first input terminal of OR683 has the day train initial control circuit 6
The day initial normal rotation control signal P ₆₃₆ from 30 is input, the day hand initial normal rotation control signal P ₆₅₀ from the day hand initialization control circuit 640 is input to the second input terminal, and the third input terminal Receives the day hand normal forward control signal P ₆₆₉ from the day hand normal control circuit 660 and outputs a logical sum signal of them from an output terminal.

The day non-rotation signal generating circuit 681 receives a predetermined frequency-divided signal P ₆₀₂ from the frequency dividing circuit ₆₀₂ and an output signal from the OR 683 as inputs, and according to the timing of the output signal from the OR 683, a day wheel train and hands described later. A day normal rotation signal P ₆₈₁ for driving the 693 in the normal rotation direction is output.

The first input terminal of OR684 has the day train initial control circuit 6
The day-of-week initial reverse control signal P ₆₃₂ is inputted from 30; the day hand reverse movement control signal P ₆₄₃ from the day hand initialize control circuit 640 is inputted to a second input terminal; The day hand initial reverse control signal P ₆₅₁ from the hand initialize control circuit 640 is input, and the day hand normal reverse control signal P ₆₇₀ from the day hand normal control circuit 660 is input to the fourth input terminal. The sum signal is output from the output terminal.

The day inversion signal generating circuit 682 receives the predetermined frequency-divided signal P ₆₀₂ from the frequency dividing circuit ₆₀₂ and the output signal from the OR 684 as inputs, and according to the timing of the output signal from the OR 684, a day wheel train and hands 693 to be described later. , And outputs a 32 Hz day reverse rotation signal P ₆₈₂ for driving in the reverse direction.

To one input terminal of OR685 the曜正rolling signal P ₆₈₁ is inputted, the to the other input terminal the day reverse signal P ₆₈₂ is input, for the day driving a signal by the logical OR from the output terminal The signal P ₆₈₅ is output.

Reference numeral 690 denotes day driving means, which includes a day driving circuit 691 and a third motor 253. The day driving circuit 691 receives the day driving signal P ₆₈₅ from the day signal generating means 680 and outputs a day driving signal P ₆₉₁ from an output terminal. Day of the week drive signal P ₆₉₁
The day wheel train and hands 693 linked with the third motor 253 operate, and the day is displayed after the day hand 13 is attached.

As is clear from the above description, the day hand 13 is set to the 0 position “Sunday” in the initialization setting state of the crown 14 at the two-step position.
After initializing the position, setting the date hand 12 and day hand 13 to the current calendar in the calendar setting state of the crown 14 at the first position, it is used in the normal use state of the crown 14 at the 0 position. In the case of the agitating drive display as described above, it is necessary to align the positional relationship with the day hand 13 when initializing the day wheel train and attaching the day hand 13 before that. The day wheel train initial control circuit 630 performs this control. As the initialization operation of the day wheel train, the day hand wheel train is driven 18 times in the reverse direction and then driven nine times in the forward direction. At this point, the day hand 13 is attached to the “Saturday” position.

Second Embodiment This embodiment is a clock having both a temperature measuring function and a time measuring function and displaying both information on the same sector-shaped pointer display section. The external appearance is omitted, and the configuration and operation will be described with reference to block diagrams shown in FIGS. 7 and 8.

 It is assumed that all circuits perform positive logic operation.

 First, timing and basic operations will be described.

Reference numeral 701 denotes an oscillating / dividing circuit for displaying time in seconds, which uses a crystal oscillator as a reference oscillation source and divides its frequency to create a 1 Hz signal. (The hour and minute are indicated by separate step motors and hands (not shown).) The output is a time counter (preset 60-digit counter) that counts 702 seconds.
When 60 1 Hz signals are counted from the preset value, a full count output is output to a line 721 and is slightly delayed by a delay circuit 722. The signal is input to the set terminal S of the time counter 702 as a preset signal, and the time counter 702 is set to a predetermined preset value ( In this case, it is set to "2" and the details will be described later). The logic state of each cascaded binary element constituting the time counter 702 is input as one set of one comparison input of the coincidence detection circuit 703. Numeral 74 denotes a forward / reverse rotatable step motor, of a type in which the direction of rotation is switched by the waveform of a signal applied to a drive circuit 705 as disclosed in, for example, US Pat. No. 4,112,671.

740 is a drive coil, 741 is a rotor provided with permanent magnets and pins, 742 is a reduction gear train that meshes with the rotor pins, 743 is a pointer,
Reference numerals 774a and 744b denote stoppers for limiting the angle of movement of the pointer 743, for example, pins imprinted on the dial. 745 are graduations and numerals or symbols written on the dial, in the case of this example the inside is 0-60 seconds, the outside is a temperature scale of -10 to 50 degrees, and the scale of the significant range Two preliminary scales are provided on both outer sides, and the pointer 743 advances by one scale by one step drive. The marks at both ends indicate that the indication is scaled out when the pointer is at this position.

φ is a fast-forward signal, which is obtained from an appropriate intermediate output of the dividing stage of the oscillation / frequency dividing circuit 701, for example, 64 Hz, and is a clock signal for driving the stepping motor in the forward or reverse direction at this frequency. It is. Reference numeral 76 denotes a forward rotation signal generation circuit, and 77 denotes a reverse rotation signal generation circuit. For each step of motor driving, the former oscillates a pulse of an end polarity for simply rotating the rotor 741 and the latter oscillates the rotor 741 once. After that, a composite pulse group of both polarities is created for one-step rotation in the reverse direction, and any drive signal is applied to the switching gate group 708.
Drive circuit 7 comprising a pair of C-MOS inverters
05 input terminals. On the input side of both the forward / reverse signal generation circuit, there is a rotation direction switching gate 79 composed of AND gates 791 and 792, and the φ signal is supplied to either the forward rotation signal generation circuit 76 or the reverse rotation signal generation circuit 77 as necessary. The clock signal is supplied to the clock signal to excite the clock signal, and a forward or reverse rotation signal is output once for each clock waveform of the φ signal that has passed through the rotation direction switching gate 791.

The forward rotation signal is output to a line 761, and its waveform is a single-shot or wide pulse having the same waveform as that normally used for clock driving as shown by one step above the line 761. The reversal signal is a multi-pulse waveform output with a predetermined phase difference on lines 771 and 772, and the first and third pulses (waveforms at the top of line 71) supplied for one step of reversal motion are shown on line 771. Is output, and a second pulse (a waveform is shown above the line 772) which occurs in the middle of the two pulses is output to a line 772. The role of the first pulse at the time of reverse rotation is to slightly start the rotor 741 in the normal rotation direction, and the role of the second pulse is to return the rotor 741 slightly displaced in the normal rotation direction from the magnetic stable point by the first pulse to the stable point. The role of the third pulse is to push the rotor 741 further in the reverse direction from the stable point to complete one step of the reverse rotation. The drive circuit 705 has two input terminals belonging to each inverter, and a coil is determined according to which terminal the input is applied to.
The direction of the exciting current flowing through 740 is switched. In either forward rotation or reverse rotation, the current direction must be reversed for each step, which is caused by the switching signal line 7102 of the switching gate group 708.
Is connected to the Q output of the first stage binary element of the needle position counter 710, so that the step motor 74
The input to the drive circuit 705 switches to the right or left every time the step advances.

The needle position counter 710 is a hexadecimal up / down counter, and the addition is performed every time the forward excitation φ signal appearing on the line 7911 through the AND gate 791 is applied to its up input terminal U, and the down input terminal D The subtraction is performed each time the reverse excitation φ signal which appears at line 7921 through AND gate 792 is applied. Then, when the full counter is reached during normal rotation, a full count output is generated on line 7101 and the OR gate 711 is set to RS.
The flip-flop 712 is set. At that time, the Q output appearing on the line 7121 becomes "1", which acts on the rotation direction switching gate 79, opens the AND gate 792, and switches so that the φ signal is output on the line 7921.

The reverse excitation φ signal appearing on the line 7921 is applied to a hexadecimal reverse counter 713. The reverse rotation counter 713 is for φ for reverse excitation.
When 64 signals have been counted, a full count signal is output on line 7131. This signal is slightly delayed by the delay circuit 714 and output as a reset signal to the line 7141.
The flip-flop 712 and the hand position counter 710 are reset. The Q output of the RS flip-flop 712 goes to the “0” level again to open the AND gate 791. That is, once the stepping motor 704 enters the reverse rotation state, it must return to the normal rotation enabled state only after performing a step in the reverse direction of 64 steps.

The group of the Q outputs of the binary elements at each stage of the hand position counter 710 forms one set of the other comparison input of the coincidence detection circuit 703, and the state of each stage of the clock counter 702, which is the one comparison input. The comparison is performed, and if they match, “1”
A level signal appears, and a negative input is applied to the AND gate 791 via the AND gate 7151 in the function switching gate 715 to close the AND gate 791 and inhibit the further generation of the forward excitation φ signal. That is, when the time (for example, seconds) to be displayed by the time counter 702 advances, the hand position counter 710 performs a forward rotation fast forward so as to catch up the delay immediately, and when the counts of both counters match, the hands stop constantly. Will be

Next, temperature measurement as a physical quantity other than time information will be described. Reference numeral 716 denotes a function switching circuit that switches the function of the pointer display from the timekeeping function to the temperature display function, a manual switch and an anti-chattering circuit, and a flip-flop circuit that maintains the function switching state until it is operated again even if the hand is released. When you operate the manual switch, the line 7161
The "1" level function switching output appears on the
The AND gate 7151 in the 715 is closed and the AND gate 7152 is opened. The function switching output is logically differentiated by the pulse circuit 7162 and the RS flip-flop 712 is set from the line 7163 through the OR gate 711, and the Q output is the rotation direction switching gate. Acting on 791, the φ signal is passed only to the reverse signal generating circuit 77 side.

Eventually, when the function switching operation is performed, the motor always enters the reverse rotation operation state, but this is a temporary operation as described later.

Reference numeral 717 denotes a sensor circuit which outputs a temperature measurement result as an analog electric quantity. Reference numeral 718 denotes an A / D conversion circuit that converts this electric quantity into a digital quantity. The digital amount is stored in the data latch circuit 719, and the digital amount is compared with the output of the hand position counter 710 by the coincidence detection circuit 720. In the case of a mismatch, the state of the signal appearing on the line 7201 is at the "0" level, so that the output of the function switching gate 715 also remains at the "0" level, which acts on the negative input terminal of the AND gate 791 to cause Allows the signal to pass through the forward rotation signal generation circuit 76, but
When a coincidence output of "1" level appears on the 7201, the φ signal for forward excitation is no longer passed.

SP in the sensor circuit 717, the A / D conversion circuit 718, and the data latch circuit 719 is a sampling terminal, and the sensor circuit 717 performs measurement by a sampling input given thereto, and the A / D conversion circuit 718 performs a conversion operation. The data latch circuit 719 takes in data. Oscillation frequency divider 7
The 1 Hz output of 01 is reduced to 1/2 Hz by the 1/2 frequency dividing circuit 7221 and further becomes a trigger pulse of a 2 second cycle by the pulsating circuit 7222, which is opened by the function switching output which has become "1" level. The signal passes through an AND gate 723 and is supplied to each of the SP terminals as a sampling signal via a line 7231.

The output of the pulsing circuit 7162 is input to the timer circuit 724, which outputs a signal that takes the "1" level for a predetermined time (2 to 3 seconds) and then returns to the "0" level from that moment. This signal is supplied to the reset terminal R for forcibly resetting the data latch circuit 719 and setting all comparison outputs to zero. Immediately after the function switching circuit 716 is manually operated,
While the data latch circuit 719 is in a reset state for ~ 3 seconds, the operation of the RS flip-flop 712 reverses the step motor 74, that is, the pointer 743, for 64 steps as described above, and also resets the contents of the hand position counter 710. Then, the pointer 743 returns to the full clockwise direction, and comes into contact with the stopper 744a to stop. Substantial operation of the temperature measurement function then begins when the first sampling signal occurs on line 7231. In addition to the reversal of the number of steps corresponding to the full scale of the above pointer,
This is often done when the camera is at an intermediate position. Even at that time, the step back which always corresponds to the entire stroke of the pointer is performed. As a result, the pointer 743 always comes into contact with the stopper 744a and stops, and the one-policy position counter 710 is reset. And the hand position counter 710 are in phase at each starting position.

As is clear from the above description, the present embodiment indicates the physical quantity by rotating the pointer forward or backward by a unit angle per step and reciprocating the pointer in a predetermined angle range corresponding to a predetermined number of steps. A step motor and a pointer mechanism, a step motor drive circuit, and a conversion circuit device that converts a physical quantity into a drive signal in the number of forward or reverse rotations equal to the number of corresponding steps and supplies the same to the drive circuit. In the pointing device, a mechanical stopper for restricting the movement of the pointer so as not to exceed at least one end of the predetermined angle range, and for scanning the predetermined angle range from end to end in a direction toward the stopper. Correction circuit means for driving the stepping motor at any time corresponding to or exceeding a certain number of steps (with the operation of the function switching circuit 716, Or a reversing counter 713 or a gate 709 that operates when the indication reaches a maximum value). It is effective to recover the possible phase shift between the pointer and the needle position counter.Also, when attaching the pointer to the pointer shaft in the device assembly process, perform this operation once and then touch the pointer to the stopper 744a. When installed, the polarity of the starting pulse defined by the state of the first stage binary element of the needle position counter 710 (determined by resetting) and the direction of the magnetic pole of the rotor 741 must be matched so as not to cause a miscount. It is also very effective in production.
Of course, the full-scale stroke may be given in any direction, or may be made to reciprocate once.

Next, the insides of the sensor circuit 717 and the A / D conversion circuit 718 will be described in detail with reference to FIG. 7171 is a side temperature sensor such as a thermistor bridge, 7172 is an amplifier for temperature measurement signal (including non-linear correction means if necessary, operates intermittently by a sampling signal, and the output voltage rises with temperature), 7173 Is a sample and hold circuit for holding the analog output voltage, and 7174 is a reference voltage source for performing temperature measurement with high accuracy. The above constitutes the sensor circuit 717.

The following is the configuration of the A / D conversion circuit 718. 7181 is a voltage comparator circuit, the voltages V ₁ applied to one terminal a, compares the voltage V ₂ applied to the other terminal b, a line the logic level "1" when the V ₂ ≧ V ₁ 7182 Otherwise, output a "0" level. 7183 is a constant voltage power supply having a stable and slightly higher voltage value,
The capacitor C is charged via the TG (transmission gate) 7184 and the resistor R. This charging is performed intermittently because the φ signal passing through the AND gate 7185 opens and closes the TG 7185 intermittently.

The number of intermittent circuits in this charging operation is a hexadecimal counter 7186.
Counted by. A Q output group indicating the state of each binary element constituting the counter 7186 is extracted as an A / D conversion output 7188. When the counter 7186 reaches the full count, a "1" level output is generated on the line 7187, which acts on the negative input terminal of the AND gate 7185, and prevents the φ signal from passing any further. V ₁ input of the voltage comparator circuit 7181 is an analog output voltage of the temperature appearing on line 7175, V ₂ input capacitance C
Line 7182 while the latter is lower than the former
Is applied to the other negative input terminal of the AND gate 7185, the φ signal can pass through the AND gate 7185, and the intermittent charging operation can be continued.

However, at the moment when the charged voltage of the capacitor C matches or slightly exceeds the temperature analog output voltage, the output of the voltage comparison circuit 7181 turns to “1” to close the AND gate 7185 to perform the charging operation and the counting operation of the counter 7186. Stop. The counter 7186 is reset by the sampling signal SP. TG7189 is a transmission gate, and the sampling signal SP
Is short-circuited at the time of arrival, and the remaining charge is discharged. The characteristics of each circuit and the constants of the elements are designed so that the relationship between the measured temperature and the count output of the counter 7186 is such that a temperature of −12 ° C. corresponds to a count of 0 and + 62 ° C. corresponds to a count of 64. When the temperature is −12 ° C., the output of the amplifier 7172 is set to just zero volt.

An important point in this temperature measurement system is that when the temperature is lower than −12 ° C., V ₁ <0 V and V ₂ = 0 V, so the output of the voltage comparison circuit 7181 is already at “1” level, and the counter 7186 The count value does not change while being reset to zero by the sampling signal SP. When the temperature is higher than 64 ° C., V ₁ > V ₂ is always satisfied, so the voltage comparison circuit 7181 attempts to allow the charging operation.
The full count output of the counter 7186 stops the charging operation. For this reason, even if the measured temperature exceeds the upper or lower side of the predetermined measurement range, the driving force that causes the pointer to exceed the predetermined measurement range cannot be generated.

That is, the amplifier 7172 that sets the output at the low temperature end of the measurement range to 0 V, the voltage comparison circuit 7181, the counter 7186 and the AND gate 7185 that cannot generate an A / D conversion output exceeding the high temperature end of the measurement range are prohibited. Corresponds to circuit means.

Various modifications and embodiments can be configured in addition to the two embodiments shown above. For example, the stopper may also be used for another purpose, for example, a member constituting a dial, with which a pointer or a part of the train wheel abuts during the movement. Although only the fan-shaped display mode has been described, for example, an index that is linearly guided (driven by a rack and a pinion, a screw feed mechanism, a link mechanism, or the like) may be used. In addition, the physical quantities of the measurement target are length, pressure, force, acceleration, speed, radiation dose, light quantity, electromagnetic quantity, pulse, body temperature, skin potential, frequency, etc., and a measurement circuit corresponding thereto can be provided, Further, there may be various circuit configurations for prohibiting the driving output of the pointer to the outside of the predetermined measurement range.

In addition, a step motor having two-phase, three-phase excitation coils may of course be used. In this case, the drive waveform does not always change between normal rotation and reverse rotation, and only the phase of the excitation current supplied to each coil is changed. To change the direction of rotation.
When the pointer follows a measurement value that decreases with time, in the illustrated embodiment, the pointer once swings to the highest value, then moves over the entire range, returns to the lowest value, and gives an instruction for a new measurement value from there. However, without having to do so, there is no particular difficulty in the configuration where the pointer follows the change of the measured value in either the high or low direction by performing the operation with the minimum number of steps in both the forward and reverse directions. It is feasible.

When this configuration is adopted, it is also possible to reset the needle position counter or set the needle position counter to a specific value in advance in the work of attaching the hands, and then push the hands in aiming at the scale corresponding thereto. Also, the function switching between the time display of the clock and the time display can take various forms, and the degree of freedom regarding the configuration of the present invention is extremely large.

INDUSTRIAL APPLICABILITY As is clear from the above description, according to the present invention, a display device driven by a stepping motor and performing display while reciprocating in both predetermined limited areas,
Since the pointer can be attached or modified while maintaining the correct relation to the drive mechanism, such a device can be supplied in large quantities and at low cost with a low number of assembly steps. Further, the measurement object can be further expanded by using such an apparatus. That is, it is possible to effectively use a narrow display area and to easily apply a pointer display such as a sector display which is advantageous for visual recognition, expand an application range, and introduce freshness into an instrument design. From such a viewpoint, the industrial advantage is extremely large.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G04C 3/14 G04C 3/00 G04B 19/00

Claims (10)

(57) [Claims] A step motor rotating in both forward and reverse directions;
A gear train connected to the rotor shaft of the step motor, an information generation electronic circuit for generating information, and an information drive signal generation for converting the information generated by the information generation electronic circuit into a drive signal for the step motor and outputting the signal An electronic circuit, a pointing member coupled to the gear train, and a regulating member that restricts movement of the pointing member or the gear train beyond a movable range;
An initialization drive signal generation electronic circuit that outputs a drive signal having a sufficient number of steps to move the movable range in one direction from one end to the other end in accordance with a predetermined operation; The display device according to the pointer, wherein the indicator operates within a predetermined information display range smaller than the movable range when displaying the information. 2. An apparatus according to claim 1, wherein said indicating member is attached to one of the gear shafts of said gear train, and is a pointer for displaying said information within a sector of a predetermined angle. Display device based on the guideline to do. 3. The stepping motor according to claim 1, wherein said initial setting driving signal generating electronic circuit outputs a driving signal having a sufficient number of steps to move said movable range in one direction from one end to another end. In the opposite direction by a smaller number of steps than the sufficient number of steps.
A display device based on a pointer, comprising a means for outputting a drive signal for the pointer. 4. The information generating electronic circuit or the information generating circuit according to claim 1, wherein when the information tries to take a value to be displayed at a position beyond the predetermined information display range by the indicating member, The display device according to the pointer, wherein the information drive signal generation electronic circuit includes a circuit means for preventing the indication member from generating a drive signal output that attempts to exceed the predetermined information display range. 5. The apparatus according to claim 1, wherein the initialization drive signal generation electronic circuit has output the drive signal of the sufficient number of steps in response to the predetermined operation, in response to the predetermined operation. A pointer-based display device wherein the indicating member is coupled to the gear train in a predetermined geometric relationship. 6. The gear train according to claim 3, wherein the indicating member is coupled to the gear train in a predetermined geometric relationship when the initialization drive signal generating electronic circuit has finished outputting the second drive signal. A display device according to a pointer, characterized in that: 7. The display according to claim 1, wherein said regulating member is a rotation angle regulating member acting on one of the gears included in said gear train. 8. The display device according to claim 1, wherein the regulating member is provided at both ends of a movable range of the pointing member or the gear train. 9. The pointer according to claim 1, wherein the number of steps of the drive signal corresponding to the movable range is larger than the number of steps of the drive signal corresponding to the predetermined information display range. Display device. 10. The display device according to claim 1, wherein the information is time, time, or calendar information.