CN107705809A - A kind of control device for being used to automatically control phonograph rotating speed - Google Patents
A kind of control device for being used to automatically control phonograph rotating speed Download PDFInfo
- Publication number
- CN107705809A CN107705809A CN201711031837.2A CN201711031837A CN107705809A CN 107705809 A CN107705809 A CN 107705809A CN 201711031837 A CN201711031837 A CN 201711031837A CN 107705809 A CN107705809 A CN 107705809A
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- China
- Prior art keywords
- rotating speed
- phonograph
- control device
- disc
- control
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/02—Arrangements of heads
- G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/28—Speed controlling, regulating, or indicating
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/02—Arrangements of heads
- G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
- G11B3/34—Driving or guiding during transducing operation
Landscapes
- Rotational Drive Of Disk (AREA)
Abstract
The invention discloses a kind of control device for being used to automatically control phonograph rotating speed, wherein, the control device includes：It is arranged on the annulus with groove structure of the disc tray bottom of disc machine；The optical coupled switch component being arranged on the basetray of disc machine；The disc pallet is connected on the basetray by turntable shaft；Optical coupled switch component includes：Optical coupled switch, velocity calculator.The present invention is the control device for automatically controlling phonograph rotating speed, the groove of optical coupled switch component is by detecting the annulus with groove structure rotated, optical coupled switch component sends the rotary speed information detected to control assembly, control assembly is by the way that the rotary speed data detected is modified, and amendment rotary speed data is sent to drive motor, to reach the purpose for automatically controlling and correcting phonograph rotating speed, the rotating speed of measurement disc in real time and the function that disc rotating speed is automatically controlled and corrected can be obtained, the problem of avoiding music distortion caused by playing a record.
Description
Technical field
The present invention relates to the technical field of phonograph, more particularly to a kind of control dress for being used to automatically control phonograph rotating speed
Put.
Background technology
, it is necessary to according to different discs during the use of phonograph, the speed of phonograph is configured.Traditional
There are three speed stages to be selected for user in phonograph, rotating speed per minute there are 33.3,45,78 turns, according to the difference of disc
Corresponding speed stage is selected to play out, but in actual use, the speed stage of default setting can have speed
Deviation, and trickle velocity deviation can all cause the music distortion that disc plays, and the seeing and hearing enjoyment of user be influenceed, to making for user
With causing many puzzlements.
Traditional phonograph can not be measured the rotating speed of disc in real time, can not also be sung by judgement due to the deficiency in design
Whether the real-time rotating speed of piece and the rotating speed of required broadcasting are identical, and to be modified to the speed of phonograph, thus its presence can not
The problem of measuring the rotating speed of disc in real time and disc rotating speed be controlled and corrected.
Therefore, prior art has yet to be improved and developed.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, are used to automatically control phonograph rotating speed it is an object of the invention to provide one kind
Control device, it is intended to solve that the rotating speed of disc can not be measured existing for phonograph of the prior art in real time and to disc rotating speed
The problem of being controlled and correcting.
To achieve the above object, concrete technical scheme is as follows by the present invention：
A kind of control device for being used to automatically control phonograph rotating speed, wherein, the control device includes：
It is arranged on the annulus with groove structure of the disc tray bottom of disc machine；
The optical coupled switch component being arranged on the basetray of disc machine；
The disc pallet is connected on the basetray by turntable shaft；
The optical coupled switch component includes：Optical coupled switch, velocity calculator；The optical coupled switch is connected with velocity calculator.
The described control device for being used to automatically control phonograph rotating speed, wherein, driving is provided with the basetray
Motor, the drive motor drive disc pallet to rotate by transmission belt.
The described control device for being used to automatically control phonograph rotating speed, wherein, the annulus with groove structure is put
In the measurement portion of optical coupled switch；The measurement portion of the optical coupled switch is groove-like；The width of the groove of the measurement portion is 1-6
Millimeter.
The described control device for being used to automatically control phonograph rotating speed, wherein, control is provided with the basetray
Component；Speed set button is provided with the control assembly.
The described control device for being used to automatically control phonograph rotating speed, wherein, the control assembly respectively with speedometer
Device is calculated with drive motor to be connected.
The described control device for being used to automatically control phonograph rotating speed, wherein, it is provided with and sings on the right side of the basetray
Bar assembly.
The described control device for being used to automatically control phonograph rotating speed, wherein, the bar assembly of singing specifically includes：Pass through
Rotating shaft is connected on the basetray and sings pole socket, with it is described sing that pole socket is fixedly connected sing bar, be arranged on and sing boom end
Pickup.
The described control device for being used to automatically control phonograph rotating speed, wherein, pause is provided with the basetray
Button, described sing are provided with pause support on the downside of bar, the pause button is connected with the pause support.
The described control device for being used to automatically control phonograph rotating speed, wherein, it is provided with the downside of the basetray anti-
Shake glue post.
Beneficial effect：
A kind of control device for being used to automatically control phonograph rotating speed of the present invention, applies on phonograph, can measure in real time
The rotating speed of phonograph recording, and obtained rotating speed Real-time Feedback will be measured to control assembly, control assembly is by adjusting motor
Rotating speed is modified to the rotating speed of disc, so that user enjoys pure music, is solved phonograph of the prior art and is deposited
The rotating speed that can not measure disc in real time and the problem of disc rotating speed is controlled and corrected, avoid and produced when playing a record
The problem of raw music distortion.
Brief description of the drawings
Fig. 1 is the structural representation for being used to automatically control the control device of phonograph rotating speed of the present invention.
Fig. 2 is the structural representation being used to automatically control under the control device working condition of phonograph rotating speed of the present invention.
Fig. 3 is the local structural representation of the control device for being used to automatically control phonograph rotating speed of the present invention.
Fig. 4 is the circuit diagram for being used to automatically control the control device of phonograph rotating speed of the present invention.
Fig. 5 is the circuit structure diagram for being used to automatically control the optical coupled switch of the control device of phonograph rotating speed of the present invention.
Fig. 6 is the controling circuit structure figure for being used to automatically control the control device of phonograph rotating speed of the present invention.
Embodiment
The present invention provides a kind of control device for being used to automatically control phonograph rotating speed, to make the purpose of the present invention, technology
Scheme and effect are clearer, clear and definite, and the present invention is described in more detail below.It is it should be appreciated that described herein specific
Embodiment only to explain the present invention, is not intended to limit the present invention.
Fig. 1-Fig. 6 is referred to, Fig. 1 is the structural representation for being used to automatically control the control device of phonograph rotating speed of the present invention
Figure；Fig. 2 is the structural representation being used to automatically control under the control device working condition of phonograph rotating speed of the present invention；Fig. 3 is
The structural representation of the control device part for being used to automatically control phonograph rotating speed of the present invention；Fig. 4 is being used for certainly for the present invention
The circuit diagram of the control device of dynamic control phonograph rotating speed；Fig. 5 is the present invention for automatically controlling phonograph rotating speed
The circuit structure diagram of the optical coupled switch of control device；Fig. 6 is the control device for being used to automatically control phonograph rotating speed of the present invention
Controling circuit structure figure.As described in Figure, a kind of control device for being used to automatically control phonograph rotating speed, wherein, the control
Device includes：
It is arranged on the annulus 101 with groove structure of the bottom of disc pallet 10 of disc machine；
The optical coupled switch component 210 being arranged on the basetray 20 of disc machine；
The disc pallet 10 is connected on the basetray 20 by turntable shaft 102；
The optical coupled switch component 210 includes：Optical coupled switch 211, velocity calculator 212；The optical coupled switch 211 and speedometer
Device 212 is calculated to be connected.
Disc pallet is connected on basetray by turntable shaft, and disc pallet can be rotated around turntable shaft, is being worked
Under state, disc is placed on disc pallet, the rotation of disc is driven by the rotation of disc pallet, and pass through playback equipment
Music in disc is played out.
It is recessed in the case that the annulus fovea superior hole number setting with groove structure is more in specific implementation process
The width in hole is smaller, and the rotary speed precision that measurement obtains is higher, in actual use in order to ensure measurement accuracy, takes into account optocoupler and opens
The measurement accuracy of pass, the quantity for setting groove are 60, and the width of shrinkage pool is 0.5-5 millimeters in the groove structure.
In a specific embodiment, the optical coupled switch component 210 includes：Optical coupled switch 211, velocity calculator 212；Institute
Optical coupled switch 211 is stated with velocity calculator 212 to be connected.The shrinkage pool in the annulus with groove structure is entered by optical coupled switch
Row counts, and counts the quantity of the shrinkage pool within a period of time by optical coupled switch, velocity calculator in a period of time by that will pass through
The quantity of the shrinkage pool of optical coupled switch is crossed, is converted to the rotary speed of disc.For example, have on the annulus with groove structure 60 it is recessed
Hole, by speed set button select disc corresponding to rotating speed, rotating speed 33.3r/min, i.e. 0.555r/s, every 1000 milliseconds
The shrinkage pool number passed through is 33.3；Rotating speed is 45r/min, i.e. 0.75r/s, and the every 1000 milliseconds shrinkage pool numbers passed through are 45;Turn
Speed is 1.3r/s for 78r/min, and the every 1000 milliseconds shrinkage pool numbers passed through are 78.Can be in the statistical unit time（Such as 200 milliseconds
It is interior）The shrinkage pool number passed through is monitored in real time to the rotating speed of disc, is reduced the detection time to disc rotating speed, is greatly carried
The high detection efficiency to disc speed.
In a specific embodiment, drive motor 202 is provided with the basetray 20, the drive motor 202 is logical
Crossing transmission belt 203 drives disc pallet 10 to rotate.In specific embodiment, the outer ring with the annulus of groove structure is additionally provided with
Second annulus, transmission belt are set on the second annulus, and drive motor 202 drives transmission belt 203 to rotate, and transmission belt 203 passes through the
Two annulus drive disc pallet to be rotated.
In a specific embodiment, the annulus with groove structure is placed in the measurement portion of optical coupled switch；The light
The measurement portion of coupling switch is groove-like；The width of the groove of the measurement portion is 1-6 millimeters.The width of groove can be according to recessed
The thickness of the annulus of slot structure is set, and need to only ensure that the recess width of the measurement portion of optical coupled switch is more than and has a groove knot
The thickness of the annulus of structure and being capable of accessible rotation with the annulus of groove structure.
Under the conditions of current technology, the cost of optical coupled switch is low, and when optical coupled switch disclosure satisfy that the measurement of phonograph
Requirement to speed and precision.In actual use, very good using effect has been reached.In addition, actually using
During, to avoid visible ray from influenceing, the light that optical coupled switch is launched is infrared light, ultraviolet or laser.
In specific embodiment, control assembly 240 is provided with the basetray 20；In the control assembly 240
It is provided with speed set button 241.The speed stage matched with disc is selected by the speed set button in control assembly.
In specific embodiment, the control assembly 240 is connected with velocity calculator 212 and drive motor 202 respectively.
The rotating speed of drive motor is adjusted by sending control instruction for control assembly, and the real-time of disc is calculated in velocity calculator
Rotating speed, and real-time rotating speed is sent to control assembly, control assembly judges the real-time rotating speed of disc and turning for set gear
Whether speed is consistent, and existing motor speed is then kept when speed is consistent；Real-time rotating speed and not up to set shelves when disc
During the rotating speed of position, control assembly sends the rotating speed of control instruction increase drive motor, increases the rotating speed of disc with this；When disc
When real-time rotating speed and the rotating speed more than set gear, control assembly sends the rotating speed that control instruction reduces drive motor, with
This reduces the rotating speed of disc, by this feed-back regulatory mechanism, adjusts the real-time rotating speed of disc, until with set gear
Untill rotating speed is consistent.
In specific embodiment, the right side of basetray 20, which is provided with, sings bar assembly 250.It is described to sing bar assembly 250
The music information stored on disc can be read, and is played out.
In specific embodiment, the bar assembly 250 of singing specifically includes：It is connected to by rotating shaft on the basetray
Sing pole socket 251, with it is described sing that pole socket 251 is fixedly connected sing bar 252, be arranged on the pickup 253 for singing the end of bar 252.Sing bar
Pole socket is sung in one end connection, other end connection pickup, is sung pole socket and is then connected to by rotating shaft on the basetray, pass through certain angle
The rotation of degree, pickup is placed on disc, and disc is rotated according to certain speed, and pickup then reads what is stored on disc
Music information.
In specific embodiment, pause button 260 is provided with the basetray 20, the downside of bar 252 of singing is set
Pause support 261 is equipped with, the pause button 260 is connected with the pause support 261.When being needed during music
When promptly suspending, then pause button can be pulled, pause button drives pause support to move upwards, and it is upward that pause support will sing bar
A certain distance is jacked up, the pickup being connected with singing bar then departs from from disc, although now disc times is so rotating, due to singing
Head can not read the music information on disc, and music stops.When during music, user is connected to emergency call
When, then it can quickly stop the broadcasting of music by pulling pause button, facilitate user to be used.
In specific embodiment, the downside of basetray 20 is provided with shockproof glue post 270.The shockproof glue post can
It is caused in the course of the work to phonograph to shake into row buffering, avoid because work of the vibrations to other sophisticated electronicses
Have an impact, can also prevent from, because tachometric survey of the vibrations to optical coupled switch component has an impact, making the speed of optical coupled switch
Measurement is more accurate.In more particular embodiment, the shockproof glue post has 3.
As shown in Fig. 5-Fig. 6, Fig. 5 is the optical coupled switch for being used to automatically control the control device of phonograph rotating speed of the present invention
Circuit structure diagram；Fig. 6 is the controling circuit structure figure for being used to automatically control the control device of phonograph rotating speed of the present invention.More
In specific embodiment, the optical coupled switch 211 includes optocoupler sender unit, optocoupler signal receiving device and terminal plate
30.More specifically in embodiment, 1 pin of the optical coupled switch is connected with 3 pin of terminal plate 30,2 pin of optical coupled switch simultaneously with
2 pin of terminal plate are connected with 4 pin of optical coupled switch, and 3 pin of optical coupled switch are connected with 1 pin of terminal plate, 4 pin of optical coupled switch with
2 pin of terminal plate are connected；Wherein, the 2 pin ground connection of terminal plate.1 pin of terminal plate carries out the transmission of optical coupled switch signal.
3 pin of terminal plate are connected with by first resistor R24 with power supply, first resistor R24 one end and 3 pin phases of terminal plate
Even, the other end is connected by second resistance R28 and 3rd resistor R37 with first switch SW1 2 pin.The 2 pin ground connection of terminal plate；
1 pin of terminal plate is connected with by the 4th resistance R31 with 4 pin of the control chip U1 in control assembly 240, control chip U1's
2 pin and 3 pin are connected with velocity calculator respectively, therefore the signal sent from optical coupled switch, enter terminal plate and control core
Piece U1, transmit to velocity calculator, optical coupled switch and be connected by terminal plate and control chip U1 with velocity calculator.Control chip
U1 7 pin are connected by the 5th resistance R36 with first switch SW1 3 pin, and control chip U1 7 pin pass through the 6th resistance simultaneously
R38 is connected with first switch SW1 4 pin, the 1 pin ground connection of first switch.
Control chip U1 8 pin ground connection, control chip U1 5 pin by the 7th resistance R14 and the first electric capacity C2 one end,
Second electric capacity C5 one end, the 3rd electric capacity C6 one end, the first triode Q3 base stage are connected；First electric capacity C2 another termination
Ground；The 3rd electric capacity C6 other end is connected with the 8th resistance R16 one end, the 8th resistance R16 other end and the second electric capacity C5
The other end be connected.First triode Q3 emitter stage is connected with the second triode Q4 base stage, the second triode Q4 transmitting
Pole is grounded, the first triode Q3 colelctor electrode and the second triode Q4 colelctor electrode, the second electric capacity C5 other end, the 8th resistance
The R16 other end, the 9th resistance R1 one end are connected.4 pin of the 9th resistance R1 other end by R9 and chip U2, driving horse
2 pin, the power supply reached is connected；2 pin of the 9th resistance R1 other end also with second switch SW2, second switch SW2 3 pin, second
Switch SW 4 pin, chip U2 3 pin are connected.Chip U2 2 pin ground connection, 1 pin of chip and the SW2 of second switch 1 pin, drive
1 pin of dynamic motor 202 is connected.Wherein, the output voltage of power supply is 9-12V, and the electric current of power supply output is direct current.In addition, control
Component 240 also includes the crystal oscillator being connected with control chip U1, and control chip U1 is received by crystal oscillator
Signal be corrected.
More specifically in embodiment, first switch SW1 and second switch SW2 are ganged switch, pass through speed set button
260 can control first switch SW1 and second switch SW2 simultaneously, when speed set button is adjusted to first gear speed by user,
First switch SW1 1 pin is connected with first switch SW1 2 pin, while 2 pin of second switch SW2 1 pin and second switch SW2
It is connected；First switch SW1 transmits speed selection information to control chip U1 1 pin, control chip U1 by second resistance R28
3 human hair combing wastes of the control information through terminal plate are delivered into optical coupled switch, optical coupled switch startup work, while optical coupled switch by optocoupler signal
Sent by control chip U1 to velocity calculator, velocity calculator and send the velocity information being calculated to control chip
U1, first grade of rotating speed of velocity information and speed set button that velocity calculator is calculated control chip U1 are compared,
If optical coupled switch, existing motor speed is then kept when speed is consistent；When the velocity information that velocity calculator is calculated simultaneously
During not up to set first grade of rotating speed, control chip U1 is transmitted the control information for increasing rotating speed to driving by its 5 pin
2 pin of motor, to increase the rotating speed of drive motor, increase the rotating speed of disc with this；When the speed that velocity calculator is calculated
When information exceedes first grade of set 33.3r/min rotating speed, control chip U1 will reduce the control information of rotating speed by its 5 pin
Transmit to 1 pin of drive motor, to reduce the rotating speed of drive motor, reduce the rotating speed of disc with this, pass through this feedback regulation
Mechanism, the real-time rotating speed of disc is adjusted, up to velocity information and the first grade of set rotating speed that velocity calculator is calculated
Untill when consistent.
When speed set button is adjusted to second gear 45r/min speed by user, first switch SW1 1 pin is opened with first
3 pin for closing SW1 are connected, while second switch SW2 1 pin is connected with second switch SW2 3 pin, and system is to phonograph speed
Regulation process is same as described above.When speed set button is adjusted to third gear 78r/min speed by user, first switch
SW1 1 pin is connected with first switch SW1 4 pin, while second switch SW2 1 pin is connected with second switch SW2 4 pin, is
System is same as described above to the regulation process of phonograph speed.
In summary, the invention discloses a kind of control device for being used to automatically control phonograph rotating speed, wherein, the control
Device processed includes：It is arranged on the annulus with groove structure of the disc tray bottom of disc machine；It is arranged on the pallet of disc machine
Optical coupled switch component on base；The disc pallet is connected on the basetray by turntable shaft；The optical coupled switch
Component includes：Optical coupled switch, velocity calculator；The optical coupled switch is connected with velocity calculator.The present invention is to be used to control automatically
The control device of phonograph rotating speed processed, the groove of optical coupled switch component is by detecting the annulus with groove structure rotated, light
Coupling switch module sends the rotary speed information detected to control assembly, and control assembly is by the way that the rotary speed data detected is carried out
Amendment, and amendment rotary speed data is sent to drive motor, to reach the purpose for automatically controlling and correcting phonograph rotating speed.This hair
It is bright to solve the rotating speed that measure disc existing for phonograph of the prior art in real time and disc rotating speed is controlled automatically
The problem of system and amendment, avoid the problem of playing a record caused music distortion.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can
To be improved or converted according to the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect scope.
Claims (9)
1. a kind of control device for being used to automatically control phonograph rotating speed, it is characterised in that the control device includes：
It is arranged on the annulus with groove structure of the disc tray bottom of disc machine；
The optical coupled switch component being arranged on the basetray of disc machine；
The disc pallet is connected on the basetray by turntable shaft；
The optical coupled switch component includes：Optical coupled switch, velocity calculator；The optical coupled switch is connected with velocity calculator.
2. the control device according to claim 1 for being used to automatically control phonograph rotating speed, it is characterised in that the pallet
Drive motor is provided with base, the drive motor drives disc pallet to rotate by transmission belt.
3. the control device according to claim 1 for being used to automatically control phonograph rotating speed, it is characterised in that described to have
The annulus of groove structure is placed in the measurement portion of optical coupled switch；The measurement portion of the optical coupled switch is groove-like；The measurement portion
The width of groove be 1-6 millimeters.
4. the control device according to claim 1 for being used to automatically control phonograph rotating speed, it is characterised in that the pallet
Control assembly is provided with base；Speed set button is provided with the control assembly.
5. the control device according to claim 4 for being used to automatically control phonograph rotating speed, it is characterised in that the control
Component is connected with velocity calculator and drive motor respectively.
6. the control device according to claim 1 for being used to automatically control phonograph rotating speed, it is characterised in that the pallet
It is provided with the right side of base and sings bar assembly.
7. the control device according to claim 6 for being used to automatically control phonograph rotating speed, it is characterised in that described to sing bar
Component specifically includes：Be connected to by rotating shaft on the basetray and sing pole socket, with it is described sing that pole socket is fixedly connected sing bar,
It is arranged on the pickup for singing boom end.
8. the control device according to claim 7 for being used to automatically control phonograph rotating speed, it is characterised in that the pallet
Pause button is provided with base, described sing is provided with pause support on the downside of bar, the pause button and the pause support phase
Connection.
9. the control device according to claim 1 for being used to automatically control phonograph rotating speed, it is characterised in that the pallet
Its lower side is provided with shockproof glue post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711031837.2A CN107705809A (en) | 2017-10-30 | 2017-10-30 | A kind of control device for being used to automatically control phonograph rotating speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711031837.2A CN107705809A (en) | 2017-10-30 | 2017-10-30 | A kind of control device for being used to automatically control phonograph rotating speed |
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| CN107705809A true CN107705809A (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711031837.2A Pending CN107705809A (en) | 2017-10-30 | 2017-10-30 | A kind of control device for being used to automatically control phonograph rotating speed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108538314A (en) * | 2018-05-28 | 2018-09-14 | 深圳万百万科技有限公司 | A kind of disc machine |
| CN112576716A (en) * | 2020-12-23 | 2021-03-30 | 江苏机器时代文化创意有限公司 | Centrifugal speed regulating device suitable for hand-operated gramophone |
| WO2024032333A1 (en) * | 2022-08-09 | 2024-02-15 | 深圳市君兰电子有限公司 | Phonograph capable of automatically adjusting rotational speed |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108538314A (en) * | 2018-05-28 | 2018-09-14 | 深圳万百万科技有限公司 | A kind of disc machine |
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| CN112576716A (en) * | 2020-12-23 | 2021-03-30 | 江苏机器时代文化创意有限公司 | Centrifugal speed regulating device suitable for hand-operated gramophone |
| WO2024032333A1 (en) * | 2022-08-09 | 2024-02-15 | 深圳市君兰电子有限公司 | Phonograph capable of automatically adjusting rotational speed |
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