CN111445763A - Digital clock teaching aid - Google Patents
Digital clock teaching aid Download PDFInfo
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- CN111445763A CN111445763A CN201911121338.1A CN201911121338A CN111445763A CN 111445763 A CN111445763 A CN 111445763A CN 201911121338 A CN201911121338 A CN 201911121338A CN 111445763 A CN111445763 A CN 111445763A
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- minute
- pin
- clock
- circuit
- hour hand
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B19/00—Teaching not covered by other main groups of this subclass
- G09B19/12—Clock-reading
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G9/00—Visual time or date indication means
- G04G9/02—Visual time or date indication means by selecting desired characters out of a number of characters or by selecting indicating elements the position of which represent the time, e.g. by using multiplexing techniques
- G04G9/04—Visual time or date indication means by selecting desired characters out of a number of characters or by selecting indicating elements the position of which represent the time, e.g. by using multiplexing techniques by controlling light sources, e.g. electroluminescent diodes
Abstract
The invention discloses a digital clock teaching aid, which comprises a clock dial, wherein a dial circuit board is arranged on the clock dial, a minute hand and an hour hand are respectively arranged on the dial circuit board, a first copper sheet is arranged on the minute hand, a second copper sheet is arranged on the hour hand, the minute hand and the hour hand are respectively connected with a clock coding disc circuit and a minute coding disc circuit which are arranged on the dial circuit board, and the axle center of the hour hand is sleeved on the axle center of the minute hand to form a bearing bush structure; the dial plate circuit board is sleeved on the axis of the minute hand and is positioned between the first copper sheet and the second copper sheet to form a bearing bush structure with the minute hand. The invention can display the time indicated by the clock teaching aid on the display in real time, is convenient for children to learn and is beneficial to training the self-learning ability of the children. The whole structure is simple and reasonable, and is convenient for children to use.
Description
Technical Field
The invention belongs to the technical field of clock teaching aids, and particularly relates to a digital clock teaching aid.
Background
The clock teaching aid is the simplest tool for children to learn and know the pointer type clock, and not only can exercise the operation ability of the children, but also can enable the children to learn the reading method of the pointer type clock. For children, it is difficult to know the time indicated by the clock teaching aid, and the reading method of the pointer clock can be slowly learned only with the help of outsiders, so that the self-learning ability of the children cannot be developed. Therefore, a digital clock teaching aid is designed, and children can conveniently know and learn the pointer type clock
Disclosure of Invention
The technical problem to be solved by the invention is to provide a digital clock teaching aid aiming at the defects in the prior art, and solve the problems in the existing clock teaching aid.
The invention adopts the following technical scheme:
a digital clock teaching aid comprises a clock dial, wherein a dial circuit board is arranged on the clock dial, a minute hand and an hour hand are respectively arranged on the dial circuit board, a first copper sheet is arranged on the minute hand, a second copper sheet is arranged on the hour hand, the first copper sheet and the second copper sheet are respectively in sliding connection with a clock coding disc circuit and a minute coding disc circuit which are arranged on the dial circuit board, and the axis of the hour hand is sleeved on the axis of the minute hand to form a bearing bush structure; the dial plate circuit board is sleeved on the axis of the minute hand and is positioned between the first copper sheet and the second copper sheet to form a bearing bush structure with the minute hand.
Specifically, the top layer of the dial circuit board is a clock code disc circuit, the bottom layer is a minute code disc circuit,
the clock coding disc circuit and the minute coding disc circuit respectively comprise an outer circle, a middle circle and an inner circle, wherein the outer circle is an hour hand unit coding region and a minute hand unit coding region, the middle circle is an hour hand unit coding region and a minute hand unit coding region, and the inner circle is a pointer grounding region; the first copper sheet and the second copper sheet are respectively provided with three contacts for reducing voltages of different areas on the dial circuit board, inner rings of the clock code disc circuit and the minute code disc circuit are connected with GND, and the three contacts on the first copper sheet and the second copper sheet are respectively arranged corresponding to the outer ring, the middle ring and the inner ring of the hour hand code disc circuit board and the minute hand code disc circuit board.
Furthermore, the hour hand bit coding area is divided into 12 areas which respectively correspond to 1 to 12 points of the clock; the ten-bit coding area of the hour hand is divided into 2 areas which correspond to 1 to 9 points and 10 to 12 points of the clock respectively.
Furthermore, when the index value of the time index is in the range of 1-9 points, the triodes Q1, Q2, Q3 and Q4 are cut off, the sections a, b, c, e, d and f of the nixie tube DS2 are all conducted, the tens of bits of the clock are 0, and the nixie tube DS2 shows 0;
when the index value of the hour hand is in the range of 10-12 points, the contact of the second copper sheet enables the middle ring 1 area of the hour hand code disc circuit to be conducted with the inner ring of the hour hand code disc circuit, the level of the middle ring 1 area is pulled down, the triodes Q1, Q2, Q3 and Q4 are conducted in a saturated mode, the levels of sections a, d, e and f of the nixie tube DS2 are pulled down, the tens of bits of the clock are 1, and the nixie tube DS2 is shown as 1;
when the hour hand points at any numerical value, the contact of the second copper sheet leads the area pointed by the outer ring of the hour hand coding disc circuit to be communicated with the inner ring of the hour hand coding disc circuit, the level of the area pointed by the outer ring of the hour hand coding disc circuit is reduced, and the hour hand coding disc circuit is displayed through the nixie tube DS1 after passing through the coding and decoding circuit, namely, the clock unit numerical value.
Furthermore, the coding region is divided into 60 regions according to the number of the bits, and the 60 regions respectively correspond to 0 to 59 minutes; the coding region is divided into 6 regions corresponding to 0 to 9, 10 to 19, 20 to 29, 30 to 39, 40 to 49 and 50 to 59 minutes of minutes.
Furthermore, when the numerical value indicated by the minute hand is any numerical value, the contact of the first copper sheet respectively leads the zone indicated by the outer ring and the zone indicated by the middle ring of the minute hand coding disc circuit to be conducted with the inner ring of the minute hand coding disc circuit, the level of the zone indicated by the outer ring and the zone indicated by the middle ring of the minute hand coding disc circuit is reduced, and the ten-digit numerical value and the one-digit numerical value of the minute are finally displayed by the nixie tubes DS3 and DS4 after passing through the coding and decoding circuits.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a digital clock teaching aid, wherein a copper sheet and a circuit board are arranged below a pointer of the clock teaching aid, the circuit board is divided into different areas to be used as an input end of an encoder, the time pointed by the clock teaching aid is encoded and decoded by utilizing digital and analog electronic technologies, and finally the time is displayed through a nixie tube. The clock teaching aid is simple to operate, convenient to use and high in response speed, time indicated by the clock teaching aid can be displayed on a display in real time, and error codes can be eliminated by adopting the priority encoder. The method effectively helps children to know and learn the pointer clock reading method, can cultivate self-learning ability of children, and has good application value and popularization prospect.
Further, the hour hand and the minute hand are respectively stirred, the hour numerical value pointed by the hour hand and the minute numerical value pointed by the minute hand can be respectively coded in a clock coding disc circuit and a minute coding disc circuit, the outer ring of the clock coding disc circuit codes the units of the hour numerical value pointed by the hour hand, and the middle ring codes the tens of the hour numerical value pointed by the hour hand; the outer circle of the minute coding disc circuit codes the units of the minute numerical value indicated by the minute pointer, and the middle circle codes the tens of the minute numerical value indicated by the minute pointer; the tens and the units of the clock value and the tens and the units of the minute value are respectively encoded, and the hour value pointed by the time pointer is displayed through independent decoding and displaying circuits of the tens and the units of the clock value; and the minute value pointed by the minute pointer is displayed through a ten-bit and one-bit independent decoding and displaying circuit.
In conclusion, the clock teaching aid can display the time indicated by the clock teaching aid on the display in real time, is convenient for children to learn and is beneficial to training the self-learning ability of the children. The whole structure is simple and reasonable, and is convenient for children to use.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a three-dimensional schematic view of the mechanical structure of the dial plate of the present invention;
FIG. 2 is a clock circuit diagram of the present invention;
FIG. 3 is a minute circuit diagram of the present invention;
FIG. 4 is a circuit diagram of the hour hand encoder disk according to the present invention;
FIG. 5 is a circuit diagram of a minute hand code wheel according to the present invention;
FIG. 6 is a diagram illustrating a state distribution according to the present invention.
Wherein: 1. needle separation; 2. a first copper sheet; 3. a hour hand; 4. a second copper sheet; 5. dial circuit board.
Detailed Description
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a digital clock teaching aid, when in use, a clock and minutes of the clock teaching aid are manually shifted, and a display part can display a time value pointed by a pointer in real time. The digital clock teaching aid is simple to operate, convenient to use and high in response speed, can display the time indicated by the clock teaching aid on a display in real time, is helpful for children to learn and learn the pointer clock reading method, and can cultivate the self-learning ability of the children.
Referring to fig. 1, the digital clock teaching aid of the present invention comprises a clock dial, a clock code disc circuit and a minute code disc circuit, wherein the clock dial comprises a minute hand 1, a first copper sheet 2, a second copper sheet 4, an hour hand 3 and a dial circuit board 5, the clock circuit and the minute circuit are respectively arranged on the dial circuit board 5 and respectively connected with the minute hand 1 and the hour hand 3, and the first copper sheet 2 and the second copper sheet 4 are respectively tightly sleeved on the minute hand 1 and the hour hand 3.
The axes of the minute hand 1 and the first copper sheet 2 are solid cylinders, the axes of the hour hand 3 and the second copper sheet 4 are hollow cylinders, and the hollow cylinder of the axis of the hour hand 3 is sleeved on the solid cylinder of the axis of the minute hand 1 to form a bearing bush structure; the dial plate circuit board 5 is sleeved on the solid cylinder at the axis of the minute hand 1 and is positioned between the first copper sheet 2 and the second copper sheet 4 to form a bearing bush structure with the minute hand 1.
The dial circuit board 5 is a double-layer circuit board, the top layer of which is a clock code disc circuit, and the bottom layer of which is a minute code disc circuit. The clock coding disc circuit and the minute coding disc circuit are respectively divided into an outer circle, a middle circle and an inner circle, the outer circle is an hour hand unit coding region and a minute hand unit coding region, the middle circle is an hour hand unit coding region and a minute hand unit coding region, and the inner circle is a pointer grounding region; the first copper sheet 2 and the second copper sheet 4 are respectively provided with three contacts which are used for reducing the voltage of different sections on the dial circuit board 5, the inner rings of the hour hand coding disc and the minute hand coding disc are connected with GND, and the three contacts on the first copper sheet 2 and the second copper sheet 4 respectively correspond to the outer circle, the middle circle and the inner circle of the hour hand coding disc circuit board and the minute hand coding disc circuit board.
Referring to fig. 4, the hour hand bit encoding area is divided into 12 areas, which correspond to 1 to 12 clock points, respectively. The ten-bit coding area of the hour hand is divided into 2 areas which correspond to 1 to 9 points and 10 to 12 points of the clock respectively.
Referring to FIG. 5, the coding region is divided into 60 regions corresponding to 0 to 59 minutes. The coding region is divided into 6 regions corresponding to 0 to 9, 10 to 19, 20 to 29, 30 to 39, 40 to 49 and 50 to 59 minutes of minutes.
Referring to fig. 2, the clock encoding disk circuit includes a power circuit, an encoding circuit, a decoding circuit and a display circuit.
The power supply circuit comprises a socket PW, a switch S1 and a capacitor C1 and is used for supplying power to the whole circuit system.
The coding circuit comprises a clock unit coding circuit and a clock ten-bit coding circuit.
The clock unit coding circuit comprises an exclusion R1, an R2, an R3, a ten-input four-output priority encoder U1 and an hour hand coding disc, wherein a first pin of the R1 is connected with VCC, a second pin of the R1 is respectively connected with a third pin of the U1 and a 6-point area of the hour hand coding disc, the third pin of the R1 is respectively connected with a fourth pin of the U1 and a 7-point area of the hour hand coding disc, and the fourth pin of the R3884 is respectively connected with a fifth pin of the U1 and an 8-point area of the hour hand coding disc; a first pin of the R2 is connected with VCC, a second pin is respectively connected with a thirteenth pin of the U1 and a 3-point area of the hour hand code disc, a third pin is respectively connected with a first pin of the U1 and a 4-point area of the hour hand code disc, and a fourth pin is respectively connected with a second pin of the U1 and a 5-point area of the hour hand code disc; a first pin of the R3 is connected with VCC, a second pin is respectively connected with a tenth pin of the U1 and a 9-point area of the hour-hand code disc, a third pin is respectively connected with an eleventh pin of the U1 and a 1-point area and a 11-point area of the hour-hand code disc, and a fourth pin is respectively connected with a twelfth pin of the U1 and a 2-point area and a 12-point area of the hour-hand code disc; the sixteenth pin and the eighth pin of the ten-input four-output priority encoder U1 are respectively connected with the power supplies VCC and GND.
The clock ten-bit coding circuit comprises triodes Q1, Q2, Q3 and Q4, resistors R18, R27, R28, R29 and R30 and an hour hand coding disc; emitters of triodes Q1, Q2, Q3 and Q4 are respectively connected with tenth, fifth, fourth and second pins of a nixie tube DS2, a collector is connected with GND, bases are respectively connected with one ends of resistors R27, R28, R29 and R30, the other ends of resistors R27, R28, R29 and R30 are connected with a region 1 of an hour hand code disc, and the region 1 of the hour hand code disc is connected with a power supply VCC through a resistor R18.
The decoding circuit comprises a six-input NOT gate U2 and a four-eight decoder U3, wherein a first pin of the four-eight decoder U3 is connected with a second pin of the six-input NOT gate U2; the second pin of the four-eight decoder U3 is connected with the fourth pin of the six-input NOT gate U2; a third pin, a fourth pin and a fifth pin of the four-eight decoder U3 are connected with a fourteenth pin of the six-input NOT gate U2 and are connected with a power supply VCC; a sixth pin of the four-eight decoder U3 is connected with an eleventh pin of a six-input NOT gate U2; a seventh pin of the four-eight decoder U3 is connected to a ninth pin of the six-input not gate U2; the eighth pin of the four-eight decoder U3 is connected to ground. The first pin of the six-input NOT gate U2 is connected with the seventh pin of the ten-input four-output priority encoder U1; the third pin is connected with the sixth pin of the ten-input four-output priority encoder U1; the eighth pin is connected with the ninth pin of the ten-input four-output priority encoder U1; the tenth pin is connected to the fourteenth pin of the ten-input four-output priority encoder U1, and the eighth pin is connected to GND.
The display circuit comprises a clock unit display circuit, a clock ten-bit display circuit and a time division interval circuit, wherein the clock unit display circuit comprises resistors R11, R12, R13, R14, R15, R16, R17 and a nixie tube DS1, a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, a thirteenth pin, a fourteenth pin and a fifteenth pin of a four-eight decoder U3 are sequentially connected with a tenth pin, a ninth pin, an eighth pin, a fifth pin, a fourth pin, a second pin and a third pin of the nixie tube DS1 through resistors R11, R12, R13, R14, R15, R16 and R17, and a sixteenth pin of the four-eight decoder U3 is connected with VCC; the first pin and the sixth pin of the nixie tube DS1 are connected with GND.
The clock ten-digit display circuit comprises resistors R21, R22, R23, R24, R25, R26 and a nixie tube DS2, wherein a tenth pin, a fifth pin, a fourth pin and a second pin of the nixie tube DS2 are divided into two paths, one path is connected with emitters of triodes Q1, Q2, Q3 and Q4, the other path is respectively connected with VCC through R21, R24, R25 and R26, a ninth pin of the nixie tube DS2 is connected with VCC through R22, an eighth pin of the nixie tube DS2 is connected with VCC through R23, and a first pin and a sixth pin of the nixie tube DS2 are connected with GND.
Referring to fig. 2, the time division circuit includes resistors R10 and R20 and leds D1 and D2, VCC is divided into two paths, one path is connected to GND through resistor R10 and led D1, the second path is connected to GND through resistor R20 and led D2, and L ED D1 and D2 of the time division circuit are used to separate the clock display value and the minute display value.
Referring to fig. 3, the minute code wheel circuit includes a coding circuit, a decoding circuit and a display circuit.
The coding circuit comprises a minute unit coding circuit and a minute ten unit coding circuit, and specifically comprises the following steps:
the minute bit encoding circuit comprises an exclusion R4, R5, R6, a ten-input four-output priority encoder U4 and a minute hand encoding disk,
a first pin of the R4 is connected with VCC, a second pin is respectively connected with a third pin of the U4 and the 6, 16, 26, 36, 46 and 56 minute areas of the hour hand code disc, the third pin is respectively connected with a fourth pin of the U4 and the 7, 17, 27, 37, 47 and 57 minute areas of the hour hand code disc, and the fourth pin is respectively connected with a fifth pin of the U4 and the 8, 18, 28, 38, 48 and 58 minute areas of the hour hand code disc; a first pin of the R5 is connected with VCC, a second pin is respectively connected with a thirteenth pin of the U4 and 3, 13, 23, 33, 43 and 53 minute zones of the hour hand code disc, a third pin is respectively connected with a first pin of the U4 and 4, 14, 24, 34, 44 and 54 minute zones of the hour hand code disc, and a fourth pin is respectively connected with a second pin of the U4 and 5, 15, 25, 35, 45 and 55 minute zones of the hour hand code disc; a first pin of R6 is connected with VCC, a second pin is respectively connected with a tenth pin of U4 and the 9, 19, 29, 39, 49 and 59 minute areas of the hour hand code disc, a third pin is respectively connected with an eleventh pin of U4 and the 1, 11, 21, 31, 41 and 51 minute areas of the hour hand code disc, and a fourth pin is respectively connected with a twelfth pin of U4 and the 2, 12, 22, 32, 42 and 52 minute areas of the hour hand code disc; the sixteenth pin and the eighth pin of the ten-input four-output priority encoder U4 are connected to VCC and GND, respectively, of a power supply.
The ten-bit minute coding circuit comprises exclusion R7, R8, a ten-input four-output priority encoder U7 and a minute encoding disk, wherein a first pin of the R7 is connected with VCC, a second pin is respectively connected with a first pin of the U7 and a 4 area, namely a 40-49 minute area, of the minute encoding disk, and a third pin is respectively connected with a second pin of the U7 and a 5 area, namely a 50-59 minute area, of the minute encoding disk; a first pin of the R8 is connected with VCC, a second pin is respectively connected with an eleventh pin of the U7 and a 1-point area of the minute coding disc, namely 10-19 minutes area, a third pin is respectively connected with a twelfth pin of the U7 and a 2-point area of the minute coding disc, namely 20-29 minutes area, and a fourth pin is respectively connected with a thirteenth pin of the U7 and a 3-point area of the minute coding disc, namely 30-39 minutes area; the third, fourth, fifth and sixteenth pins of the ten-input four-output priority encoder U7 are connected to the power source VCC, and the eighth pin is connected to GND.
The decoding circuit comprises a minute unit decoding circuit and a minute ten unit decoding circuit, and specifically comprises:
the minute bit decoding circuit comprises a six-input NOT gate U5 and a four-eight decoder U6; a first pin of the four-eight decoder U6 is connected with a second pin of the six-input NOT gate U5; the second pin is connected with a fourth pin of the six-input NOT gate U5; the third pin, the fourth pin and the fifth pin are connected with the fourteenth pin of the six-input NOT gate U5 and are connected with a power supply VCC; the sixth pin is connected with the eleventh pin of the sixth input NOT gate U5; the seventh pin is connected with the ninth pin of the six-input NOT gate U5; the eighth pin is grounded. The first pin of the six-input NOT gate U5 is connected with the seventh pin of U4; the sixth pin of the third pin joint U4; the eighth pin is connected with the ninth pin of the U4; the tenth pin is connected with the fourteenth pin of the U4, and the seventh pin is connected with GND.
The ten-bit minute decoding circuit comprises a six-input NOT gate U8 and a four-eight decoder U9,
a first pin of the four-eight decoder U9 is connected with a second pin of the six-input NOT gate U8; the second pin is connected with a fourth pin of the six-input NOT gate U8; the third pin, the fourth pin and the fifth pin are connected with the fourteenth pin of the six-input NOT gate U8 and are connected with a power supply VCC; the sixth pin is connected with the eleventh pin of the sixth input NOT gate U8; the seventh pin is connected with the ninth pin of the six-input NOT gate U8; the eighth pin is grounded. The first pin of the six-input NOT gate U8 is connected with the seventh pin of U7; the sixth pin of the third pin joint U7; the eighth pin is connected with the ninth pin of the U7; the tenth pin is connected with the fourteenth pin of the U7, and the seventh pin is grounded.
The display circuit comprises a minute unit display circuit and a minute tens display circuit, wherein the minute unit display circuit comprises resistors R41, R42, R43, R44, R45, R46, R47 and a nixie tube DS 4; the ninth pin, the tenth pin, the eleventh pin, the twelfth pin, the thirteenth pin, the fourteenth pin and the fifteenth pin of the four-eight decoder U6 are sequentially connected with the tenth pin, the ninth pin, the eighth pin, the fifth pin, the fourth pin, the second pin and the third pin of the nixie tube DS4 through resistors R41, R42, R43, R44, R45, R46 and R47, the first pin and the sixth pin of the nixie tube DS4 are grounded, and the sixteenth pin of the four-eight decoder U6 is connected with VCC. The ten-digit minute display circuit comprises resistors R31, R32, R33, R34, R35, R36, R37 and a nixie tube DS3, wherein a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, a thirteenth pin, a fourteenth pin and a fifteenth pin of the four-eight decoder U9 are sequentially connected with a tenth pin, a ninth pin, an eighth pin, a fifth pin, a fourth pin, a second pin and a third pin of the nixie tube DS3 through resistors R31, R32, R33, R34, R35, R36 and R37, the first pin and the sixth pin of the nixie tube DS2 are grounded, and a sixteenth pin of the four-eight decoder U9 is connected with VCC.
The outer ring of the hour hand code disc circuit can pull the level of each clock area to high level under the action of exclusion R1, R2 and R3, and the middle ring of the hour hand code disc circuit can pull the level of area 1 to high level under the action of a resistor R18; the outer ring and the middle ring of the minute hand code disc circuit can pull the electric level of each minute zone to high level under the action of pull-up resistors R4, R5, R6, R7 and R8. Furthermore, when the contacts of the second copper sheet and the first copper sheet contact different clocks and minute divisions, the outer ring and the middle ring coding area corresponding to the hour hand coding disc circuit and the minute hand coding disc circuit are in short circuit with the inner ring thereof, and further, the time division is pulled down from high level to low level.
Referring to fig. 4, 5 and 6, after the switch S1 is closed, the nixie tubes DS1, DS2, DS3 and DS4 display the time pointed by the current pointer in real time, and L ED D1 and D2 separate the clock value from the minute value.
The clock display working principle is as follows:
when the hour index value is in the range of 1-9 points, the triodes Q1, Q2, Q3 and Q4 are cut off, the sections a, b, c, e, d and f of the nixie tube DS2 are all turned on and are displayed as 0, namely the tens of clock is 0; when the index value of the hour hand is in the range of 10-12 points, the contact of the second copper sheet 4 enables the middle ring 1 area of the hour hand code disc circuit to be conducted with the inner ring of the hour hand code disc circuit, the level of the middle ring 1 area is pulled down, at the moment, the triodes Q1, Q2, Q3 and Q4 are conducted in a saturated mode, the levels of sections a, d, e and f of the digital tube DS2 are pulled down, at the moment, the level is displayed as '1', namely, the tens of hours are 1. When the hour hand points at any numerical value, the contact of the second copper sheet 4 enables the area pointed by the outer ring of the hour hand coding disc circuit to be communicated with the inner ring of the hour hand coding disc circuit, the level of the area pointed by the outer ring of the hour hand coding disc circuit is lowered, and the hour hand coding disc circuit is displayed through the nixie tube DS1 after passing through the coding and decoding circuit, namely, the clock unit numerical value.
The minute display working principle is as follows:
when the numerical value indicated by the minute hand is any numerical value, the contact of the first copper sheet 2 respectively leads the zone indicated by the outer ring and the zone indicated by the middle ring of the minute hand coding disc circuit to be conducted with the inner ring of the minute hand coding disc circuit, the level of the zone indicated by the outer ring and the zone indicated by the middle ring of the minute hand coding disc circuit is reduced, and the ten-digit numerical value and the one-digit numerical value of the minute hand are finally displayed by the nixie tubes DS3 and DS4 after passing through the coding and decoding circuit.
The invention relates to a digital clock teaching aid, wherein a copper sheet and a circuit board are arranged below a pointer of the clock teaching aid, the circuit board is divided into different areas to be used as an input end of an encoder, the time pointed by the clock teaching aid is encoded and decoded by utilizing digital and analog electronic technologies, and finally the time is displayed through a nixie tube. The clock teaching aid is simple to operate, convenient to use and high in response speed, time indicated by the clock teaching aid can be displayed on a display in real time, and error codes can be eliminated by adopting the priority encoder. The method effectively helps children to know and learn the pointer clock reading method, can cultivate self-learning ability of children, and has good application value and popularization prospect.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. A digital clock teaching aid is characterized by comprising a clock dial, wherein the clock dial is provided with a dial circuit board (5), the dial circuit board (5) is respectively provided with a minute hand (1) and an hour hand (3), the minute hand (1) is provided with a first copper sheet (2), the hour hand (3) is provided with a second copper sheet (4), the first copper sheet (2) and the second copper sheet (4) are respectively in sliding connection with a clock code disc circuit and a minute code disc circuit which are arranged on the dial circuit board (5), and the axis of the hour hand (3) is sleeved on the axis of the minute hand (1) to form a bearing bush structure; the dial plate circuit board (5) is sleeved on the axis of the minute hand (1), is positioned between the first copper sheet (2) and the second copper sheet (4), and forms a bearing bush structure with the minute hand (1).
2. A digital clock teaching aid as claimed in claim 1, wherein the top layer of the dial circuit board (5) is a clock code disc circuit, the bottom layer is a minute code disc circuit,
the clock coding disc circuit and the minute coding disc circuit respectively comprise an outer circle, a middle circle and an inner circle, wherein the outer circle is an hour hand unit coding region and a minute hand unit coding region, the middle circle is an hour hand unit coding region and a minute hand unit coding region, and the inner circle is a pointer grounding region; the first copper sheet (2) and the second copper sheet (4) are respectively provided with three contacts for reducing voltages of different sections on the dial circuit board (5), inner rings of the clock code disc circuit and the minute code disc circuit are connected with GND, and the three contacts on the first copper sheet (2) and the second copper sheet (4) are respectively arranged corresponding to the outer ring, the middle ring and the inner ring of the hour hand and minute hand code disc circuit boards.
3. The digital clock teaching aid of claim 2, wherein the hour hand bit coding region is divided into 12 regions which respectively correspond to 1 to 12 points of the clock; the ten-bit coding area of the hour hand is divided into 2 areas which correspond to 1 to 9 points and 10 to 12 points of the clock respectively.
4. The digital clock teaching aid of claim 3, wherein when the index value is in the range of 1-9 points, the triodes Q1, Q2, Q3 and Q4 are turned off, the sections a, b, c, e, d and f of the nixie tube DS2 are all turned on, the tens of bits of the clock is 0, and the nixie tube DS2 shows 0;
when the index value of the hour hand is in the range of 10-12 points, the contact of the second copper sheet (4) enables the middle ring 1 area of the hour hand code disc circuit to be conducted with the inner ring of the hour hand code disc circuit, the level of the middle ring 1 area is reduced, the triodes Q1, Q2, Q3 and Q4 are conducted in a saturated mode, the levels of sections a, d, e and f of the nixie tube DS2 are reduced, the ten bits of the clock are 1, and the nixie tube DS2 is displayed as 1;
when the hour hand points at any numerical value, the contact of the second copper sheet (4) enables the area pointed by the outer ring of the hour hand coding disc circuit to be communicated with the inner ring of the hour hand coding disc circuit, the level of the area pointed by the outer ring of the hour hand coding disc circuit is lowered, and the hour hand coding disc circuit is displayed through the nixie tube DS1 after passing through the coding and decoding circuit, namely, the clock unit numerical value.
5. The digital clock teaching aid of claim 2, wherein the minute-oriented unit encoding area is divided into 60 areas, which correspond to 0 to 59 minutes; the coding region is divided into 6 regions corresponding to 0 to 9, 10 to 19, 20 to 29, 30 to 39, 40 to 49 and 50 to 59 minutes of minutes.
6. The digital clock teaching aid as claimed in claim 5, wherein when the value indicated by the minute hand is any value, the contact points of the first copper sheet (2) respectively conduct the area indicated by the outer circle and the area indicated by the middle circle of the circuit of the minute hand code disc with the inner circle thereof, lower the level of the areas indicated by the outer circle and the middle circle thereof, and finally display the tens value and the units value of the minute by the nixie tubes DS3 and DS4 after passing through the coding and decoding circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911121338.1A CN111445763A (en) | 2019-11-15 | 2019-11-15 | Digital clock teaching aid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911121338.1A CN111445763A (en) | 2019-11-15 | 2019-11-15 | Digital clock teaching aid |
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| CN111445763A true CN111445763A (en) | 2020-07-24 |
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Application publication date: 20200724 |