CN108267921A - Can remote control projector lens block/open control box - Google Patents
Can remote control projector lens block/open control box Download PDFInfo
- Publication number
- CN108267921A CN108267921A CN201810058520.6A CN201810058520A CN108267921A CN 108267921 A CN108267921 A CN 108267921A CN 201810058520 A CN201810058520 A CN 201810058520A CN 108267921 A CN108267921 A CN 108267921A
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- CN
- China
- Prior art keywords
- motor
- projector lens
- circuit
- control
- rack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
Abstract
The invention discloses a kind of remote-controlled projector lens to block/open control box, and the position that shell corresponds to projector lens is equipped with trepanning, and control circuit and rack and pinion drive mechanism are placed in intermediate plate.Governor circuit control motor rotation and motor direction of rotation, gear are mounted on the output shaft of reduction box, are moved forward and backward with the rotation band carry-over bar of motor, the baffle on rack is moved forward and backward realization with rack and projector lens are blocked and opened.The present invention need not change projecting apparatus, can be widely applied to all types of projecting apparatus realize to projector lens block and open function.
Description
Technical field
The present invention relates to one kind can remote control projector lens block/open control box, described device is related to circuit control
System and mechanical design field, blocking and opening suitable for all kinds of projector lens.
Background technology
With the prosperity of high definition television medium and the expansion in household audio and video system market, projecting apparatus is used as by big
Screen obtains the medium of image information, and demand and supply increases rapidly.At present, projecting apparatus is widely used in various social activitieies,
But the startup and closing of projecting apparatus in use are required for certain stand-by period.When the projector is in use, projection ray's direct projection
It, can be by strong source stimulating simultaneously by the eyes of personnel if thering are personnel to pass through before projection screen at this time on projection screen
The broadcasting content of projecting apparatus can not normally be watched by also resulting in other viewers, cause very poor user experience；But if temporarily
Close projecting apparatus, until crowd's warp is again started up projecting apparatus later, instrument to be projected start completely need to wait for one section longer when
Between, it very influences information and launches process.
In addition, it is being thrown in the demand that many meeting occasions are quickly blocked and opened there is also projector lens, such as speaker
Shadow instrument, which needs projector image is momentarily closed during broadcast information, to be explained；In education activities, work as projection
When instrument works, projection ray's direct projection is write on blackboard at this time on blackboard, does not see writing on the blackboard content, also needs to make
It uses projector lens and quickly opens and block function.
On the other hand, in public domain, to be generally furred ceiling fixedly mounted for projecting apparatus, can not be by manually or using object
Block projection ray.The present invention blocks control box by camera lens and realizes blocking and opening to projector lens, in effect not only
It is avoided that by strong illumination when someone passes through, while does not interfere with information and launch process, while be designed with remote control, it can be remote
Process control blocking and opening to projector lens.Efficiently solve public domain projecting apparatus play video when occur ask
Topic, is more bonded people-oriented design concept.
Invention content
1st, goal of the invention.
The present invention is directed to realize the function of blocking and open to projector lens by button and remote controler realization, provide
Control box is blocked and opened to one kind suitable for all kinds of projector lens.
2nd, the technical solution adopted in the present invention
The present invention propose one kind can remote control projector lens block/open control box, described device includes master control
Circuit, motor and rack-and-pinion retaining device.Governor circuit includes microcontroller U1, switching circuit, indicator light circuit, wireless receiving
Modular circuit and motor control H-bridge circuit；The P1 and P2 of governor circuit connect P1, P2 end of motor control H-bridge circuit respectively.
Governor circuit controls motor positive and inverse, and the work(for blocking and opening for realizing projector lens is moved forward or rearward with carry-over bar
Energy.
In further specific embodiment, KG1+, KG2+ end point of motor control H-bridge circuit in the governor circuit
It is not placed in intermediate plate rack guide rail groove both ends.H-bridge circuit is controlled when the movement of rack front end is connected into motor by KG1+ in place, is made
P1, P2 end are low level in motor control H-bridge circuit, and motor stalls.Similarly, projecting apparatus mirror is opened when rack moves backward
Head is connected into motor by KG2+ and controls H-bridge circuit, and it is low level to make P1, P2 end in motor control H-bridge circuit, and motor stalls.
In further specific embodiment, the wicket component that blocks includes motor, gear and rack baffle.Motor
Band moving gear rotating, the rack being engaged with are moved forward or rearward, and throwing is blocked and open so as to which baffle movement be driven to realize
Shadow instrument camera lens.
In further specific embodiment, the indicator light circuit L1 connection lens block indicator light, export low electricity
Usually indicator light lights, and indicator light extinguishes when exporting high level.
In further specific embodiment, the PC5 ports connection in the microcontroller, which receives, blocks button switch
Output signal, microcontroller input low level, the connection of microcontroller PC4 ports receive the output signal for switch of releasing the button, microcontroller
Input low level.
In further specific embodiment, the working frequency of the wireless receiving module and wireless transmission remote controler is
433.92MHZ working method is crawl.
In further specific embodiment, the projecting apparatus casing includes casing upper plate, intermediate plate, lower plate and outer
Shell.Shell is equipped with opening in projector lens position.The intermediate plate is equipped with the guiding groove of guiding rack movement, the slot of groove
Bottom is equipped with trepanning in the position of baffle mobile route and is used to support the boss of fixing circuit board.The lower plate is equipped with support
Column is used to support fixed intermediate plate.
3rd, technique effect caused by the present invention
(1) present invention realizes that baffle is blocked and opened to the quick of projecting apparatus using the rotating of governor circuit control motor
It opens；
(2) present invention can effectively avoid projecting apparatus from playing the time shining face and cause discomfort, be more bonded taking human as
This design concept；
(3) present invention, which can realize, blocks projector lens rear quick unlatching, avoids projecting apparatus starting up's time
It is long and video is caused not play in time, influence the problem of information launches process；
(4) present invention can by wireless transmission remote controler realize projector lens are blocked and breakdown action it is long-range distant
Control.
Description of the drawings
Fig. 1 for can remote control projector lens block/open control box outer cage schematic diagram.
Fig. 2 for can remote control projector lens block/open control box mounting platform schematic diagram.
Fig. 3 for can remote control projector lens block/open control box wireless transmission remote controler schematic diagram.
Fig. 4 is blocked and opening technology flow chart for projector lens.
Fig. 5 each pin lines of circuit microcontroller U1, ON-OFF control circuit and indicator light schematic diagram in order to control.
Fig. 6 controls motor positive/reverse rotation circuit figure in circuit in order to control.
1. projector case's upper plates of Tu Zhong, 2. projector case's intermediate plates, 3. projector case's lower plates, 4. projector lens
Trepanning, 5. projector cases, 6. camera lenses block control button K1, and 7. camera lenses open control button K2, and 8. camera lenses block indicator light
9. governor circuit, 10. main control board pillars, 11. rack sliding slots, 12. racks and baffle, 13. gears, 14. motors, 15. nothings
Line remote control camera lens blocks button, and 16. wireless remote control camera lenses are released the button.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in figures 1 to 6, can remote control projector lens block/open control box include 1. projector case's upper plates,
2. projector case's intermediate plate, 3. projector case's lower plates, 4. projector lens trepannings, 5. projector cases, 6. camera lenses block
Control button K1,7. camera lenses open control button K2, and 8. camera lenses block indicator light, 9. governor circuits, 10. main control board branch
Column, 11. rack sliding slots, 12. racks and baffle, 13. gears, 14. motors, 15. wireless remote control camera lenses block button, and 16. is wireless
Remote control camera lens is released the button.
Projector case 5 is equipped with opening 4 in projector lens corresponding position, for projecting apparatus light extraction.Separately projecting apparatus is each
A heat emission hole, remote control reception, supply hub and circuit board energization jack on intermediate plate are equal in 5 corresponding position of shell
Equipped with opening.Projector case's upper plate 1 is equipped with control switch button K1, K2 and camera lens blocks indicator light 8.
As shown in Fig. 2, it is projecting apparatus casing intermediate plate shown in figure.To projector lens block and breakdown action passes through
Governor circuit 9 controls motor rotating forward to block and invert unlatching and realizes.Governor circuit includes U1 microcontrollers, wireless receiving module electricity
Road, button switch circuit, indicator light circuit and motor control H-bridge circuit.
U1 microcontrollers have used PD2, PD3, PB4, PB5, PC4, PC5 and PC7 totally 7 ports.Wherein, PD3 and PD2 difference
Two output signals of wireless receiving module are received, when remote controller buttons A or B are pressed to microcontroller input low level, are unclamped
To microcontroller input high level during button A or B.
L1 control projecting apparatus blocks indicator light 8, and indicator light lights when exporting low level, and indicator light is put out when exporting high level
It goes out.
Q1 receives the output signal of control switch button 6, is bounced by during lower switch 6 to microcontroller input low level, switch 6
When to microcontroller input high level；Q2 receives the output signal of control switch button 7, low by being inputted during lower switch 7 to microcontroller
Level, to microcontroller input high level when switch 7 bounces.
P1 and P2 is motor control terminal mouth, H-bridge circuit is controlled to rotate forward motor by motor, reversion and stalling are controlled
System, M+ and M- ports connect the anode and cathode of motor respectively.Triode Q3, field when P1 outputs high level, P2 output low levels
Effect pipe Q1 and Q6 are connected, and triode Q4, field-effect tube Q2 and Q5 cut-off, electric current by M+ (motor anode), flowing to M-, (bear by motor
Pole), motor rotates forward.Triode Q3, field-effect tube Q1 and Q6 cut-off, triode when P1 outputs low level, P2 output high level
Q4, field-effect tube Q2 and Q5 conducting, electric current flow to M+ (motor anode), motor reversal by M- (electrode negative).When P1, P2 are defeated
Triode Q3, Q4 and field-effect tube Q1, Q2, Q5 and Q6 are turned off when going out low level, and (motor is born by M+ (motor anode) and M-
Pole) between no current flow through, motor stalling.
Limit circuit in governor circuit, KG1+, KG2+ are motor control terminal mouth, when P1 exports high level, P2 exports low electricity
Usually motor rotates forward, when motor-driven rack-and-pinion is moved to the position for blocking projector lens, KG1+ output low levels,
P1 and P2 exports the stalling of low level motor at this time；The motor reversal when P1 exports low level, P2 output high level, at this time motor
Rack-and-pinion reverse movement projector lens is driven gradually to open, opening KG2+ completely when projector lens exports low level, this
When P1 and P2 export the stalling of low level motor.
Button 15 on wireless transmission remote controler is used to block operation to projector lens progress wireless remote control；Button 16 is used
In to projector lens progress wireless remote control opening operation；The length in the case where camera lens is blocked of indicator light 8 is bright, is used for reminding
Family projector lens are in the state that is blocked, and camera lens extinguishes after opening；Wireless receiving module circuit in governor circuit 9 receives hair
Blocking on remote controler, open signal are penetrated, U1 microcontrollers carry out signal processing, and control motor 14, gear 13 rotate, and baffle is enabled to hold
Row blocks, breakdown action, while camera lens is controlled to block the light on and off of indicator light 8.
It blocks wicket component and includes motor 14, the gear 13 being connected with motor output shaft and rack baffle integrated component
12.The slot bottom of groove 11 is equipped with trepanning in the position of baffle mobile route.Motor 14 is rotated forward with moving gear 13, is engaged with gear 13
Rack 12 move forward therewith, baffle, which moves forward, to be completed to block the function of camera lens, and 12 front end face of rack is moved to and groove
11 inner faces contact, and baffle covers camera lens completely at this time, and rack 12 is connected into governor circuit KG1+ by the trepanning of groove side, electricity
Machine stops.Governor circuit output signal control motor 14 inverts, and band moving gear 13 inverts, and rack 12 moves back under gear drive
Dynamic, baffle moves backward opening projector lens, is moved to rack and is contacted with groove inner face, and master control electricity is connected by KG2+
Road, motor stalling.
Can remote control projector lens block/open control box can be selected with projecting apparatus installation site difference it is different
Control mode control camera lens is blocked and is opened.When projecting apparatus is hung or during mounted on the position that human hand can not contact, using wireless
Remote control mode blocks camera lens or opens and controls；When projecting apparatus is positioned over the tangibly position of human hand, can be used directly
Control button control camera lens is blocked or is opened.
Claims (8)
1. can remote control projector lens block/open control box, including：
Projecting apparatus casing, the projecting apparatus casing is divided into be separated for two layers up and down by one piece of intermediate plate, and projecting apparatus, and machine are placed by lower floor
Shell is equipped with opening in the corresponding position of projector lens, and the mechanical structure and control circuit are mounted on intermediate plate；
Wicket component is blocked, the wicket component that blocks includes motor and rack-and-pinion baffle mechanism；
Governor circuit, the control circuit output signal control motor positive and inverse and control rack stop in place.
2. it is according to claim 1 can remote control projector lens block/open control box, it is characterised in that：It is described
Governor circuit include U1 microcontrollers, wireless receiving module circuit, button switch circuit, indicator light circuit and motor control H
Bridge circuit；PB4, PB5 of governor circuit connect the motor control P1 ends of H-bridge circuit and P2 ends, wireless receiving module circuit respectively
Connect PD2 and PD3 ports, indicator light circuit connection PC7 ports, button switch circuit connection PC4 and PC5 ports.
3. it is according to claim 1 can remote control projector lens block/open control box, it is characterised in that：It is described
Block motor output shaft in wicket component with gear to be connected, motor driven gear rotating, the rack being engaged with forward or to
After move, block and open projector lens so as to which baffle movement be driven to realize, after rack moves in place, motor stalls,
Rack movement stops.
4. it is according to claim 1 can remote control projector lens block/open control box, it is characterised in that：It is described
Intermediate plate is equipped with the guiding groove of guiding rack movement and is used to support the boss of fixing circuit board, the projecting apparatus casing
Casing upper plate, lower plate and shell are further included, the lower plate is used to support fixed intermediate plate equipped with support column.
5. it is according to claim 2 can remote control projector lens block/open control box, which is characterized in that it is described
Governor circuit in control motor H-bridge circuit, PB4 and PB5 port in order to control, H-bridge circuit is controlled to rotate forward motor by motor,
Reversion and stalling are controlled, M+ and M- ports connect the anode and cathode of motor respectively；When PB4 outputs high level, PB5 outputs are low
Triode Q3, field-effect tube Q1 and Q6 conducting during level, triode Q4, field-effect tube Q2 and Q5 cut-off, electric current flow to M- by M+,
Motor rotates forward；Triode Q3, field-effect tube Q1 and Q6 cut-off when PB4 outputs low level, PB5 output high level, triode Q4,
Field-effect tube Q2 and Q5 are connected, and electric current flows to M+, motor reversal by M-；Triode Q3, Q4 when PB4, PB5 export low level
And field-effect tube Q1, Q2, Q5 and Q6 are turned off, no current flows through between M+ and M-, motor stalling.
6. it is according to claim 2 can remote control projector lens block/open control box, which is characterized in that it is described
Governor circuit in limit circuit, KG1+, KG2+ be motor control terminal mouth, when PB4 export high level, PB5 output low level when
Motor rotates forward, when motor-driven rack-and-pinion is moved to the position for blocking projector lens, KG1+ output low levels, at this time
Motor stalls；When PB4 export low level, PB5 output high level when motor reversal, at this time motor driven gear rack move backward
Projector lens are gradually opened, and when projector lens open KG2+ output low levels completely, motor stalls at this time.
7. it is according to claim 2 can remote control projector lens block/open control box, it is characterised in that：It is described
PD2, PD3 port of microcontroller connect the two-way output signal of wireless receiving module circuit respectively, when wireless transmission remote controler
It presses and blocks button, button, microcontroller input high level are blocked in microcontroller input low level, release.
8. it is according to claim 2 can remote control projector lens block/open control, it is characterised in that：Described
Indicator light circuit L1 connection lens block indicator light, and indicator light lights when exporting low level, and indicator light extinguishes when exporting high level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810058520.6A CN108267921A (en) | 2018-01-22 | 2018-01-22 | Can remote control projector lens block/open control box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810058520.6A CN108267921A (en) | 2018-01-22 | 2018-01-22 | Can remote control projector lens block/open control box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108267921A true CN108267921A (en) | 2018-07-10 |
Family
ID=62776272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810058520.6A Pending CN108267921A (en) | 2018-01-22 | 2018-01-22 | Can remote control projector lens block/open control box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108267921A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108992862A (en) * | 2018-07-25 | 2018-12-14 | 上饶师范学院 | A kind of mine worker physical fitness management system |
| CN109507920A (en) * | 2018-11-06 | 2019-03-22 | 南京理工大学常熟研究院有限公司 | It can recognize the projector automatic control device of switch door state |
| CN111557560A (en) * | 2020-05-07 | 2020-08-21 | 浙江荣泰健康电器有限公司 | Application method and equipment of multifunctional massage chair with intelligent cinema system |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2194055Y (en) * | 1994-03-21 | 1995-04-05 | 中国石化扬子石油化工公司 | Remote control opening and closing device for lens cap of ceiling projector |
| CN2196977Y (en) * | 1994-06-04 | 1995-05-17 | 张振军 | Automatic curtain machine with a gearing |
| CN2214782Y (en) * | 1994-12-28 | 1995-12-13 | 沈剑铭 | Electric curtain-operating device |
| CN1432862A (en) * | 2002-01-14 | 2003-07-30 | 明基电通股份有限公司 | Lens cap assembly |
| CN1523440A (en) * | 2003-02-20 | 2004-08-25 | 明基电通股份有限公司 | Projector shading apparatus and projector having the apparatus |
| JP2008203595A (en) * | 2007-02-21 | 2008-09-04 | Seiko Epson Corp | Projector |
| CN201170018Y (en) * | 2008-03-17 | 2008-12-24 | 励士杰 | Automatic opening and closing device of external type translational door and window |
| CN101799618A (en) * | 2010-03-12 | 2010-08-11 | 上海型与行电子技术有限公司 | Shading control device of projector |
| JP2010271346A (en) * | 2009-05-19 | 2010-12-02 | Seiko Epson Corp | Projector |
| CN102055384A (en) * | 2010-12-28 | 2011-05-11 | 上海力荣实业发展有限公司 | Drive circuit and method for controlling motor positive and negative rotation of programmable single chip microcomputer |
| CN203705960U (en) * | 2013-12-31 | 2014-07-09 | 东北农业大学 | Apparatus for remote control of shooting rotary disk |
| CN203799168U (en) * | 2014-03-03 | 2014-08-27 | 恩益禧视像设备贸易（深圳）有限公司 | Lens cap assembly and projector comprising same |
| CN203813706U (en) * | 2014-02-21 | 2014-09-03 | 广东瑞德智能科技股份有限公司 | A direct current motor forward-rotating and counter-rotating control circuit |
| CN105068366A (en) * | 2015-09-01 | 2015-11-18 | 曾维 | Projector type automatic dustproof system |
| WO2016153512A1 (en) * | 2015-03-26 | 2016-09-29 | Hewlett-Packard Development Company L. P. | Camera shutters |
| JP2016177143A (en) * | 2015-03-20 | 2016-10-06 | 株式会社リコー | Image projection device |
-
2018
- 2018-01-22 CN CN201810058520.6A patent/CN108267921A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2194055Y (en) * | 1994-03-21 | 1995-04-05 | 中国石化扬子石油化工公司 | Remote control opening and closing device for lens cap of ceiling projector |
| CN2196977Y (en) * | 1994-06-04 | 1995-05-17 | 张振军 | Automatic curtain machine with a gearing |
| CN2214782Y (en) * | 1994-12-28 | 1995-12-13 | 沈剑铭 | Electric curtain-operating device |
| CN1432862A (en) * | 2002-01-14 | 2003-07-30 | 明基电通股份有限公司 | Lens cap assembly |
| CN1523440A (en) * | 2003-02-20 | 2004-08-25 | 明基电通股份有限公司 | Projector shading apparatus and projector having the apparatus |
| JP2008203595A (en) * | 2007-02-21 | 2008-09-04 | Seiko Epson Corp | Projector |
| CN201170018Y (en) * | 2008-03-17 | 2008-12-24 | 励士杰 | Automatic opening and closing device of external type translational door and window |
| JP2010271346A (en) * | 2009-05-19 | 2010-12-02 | Seiko Epson Corp | Projector |
| CN101799618A (en) * | 2010-03-12 | 2010-08-11 | 上海型与行电子技术有限公司 | Shading control device of projector |
| CN102055384A (en) * | 2010-12-28 | 2011-05-11 | 上海力荣实业发展有限公司 | Drive circuit and method for controlling motor positive and negative rotation of programmable single chip microcomputer |
| CN203705960U (en) * | 2013-12-31 | 2014-07-09 | 东北农业大学 | Apparatus for remote control of shooting rotary disk |
| CN203813706U (en) * | 2014-02-21 | 2014-09-03 | 广东瑞德智能科技股份有限公司 | A direct current motor forward-rotating and counter-rotating control circuit |
| CN203799168U (en) * | 2014-03-03 | 2014-08-27 | 恩益禧视像设备贸易（深圳）有限公司 | Lens cap assembly and projector comprising same |
| JP2016177143A (en) * | 2015-03-20 | 2016-10-06 | 株式会社リコー | Image projection device |
| WO2016153512A1 (en) * | 2015-03-26 | 2016-09-29 | Hewlett-Packard Development Company L. P. | Camera shutters |
| CN105068366A (en) * | 2015-09-01 | 2015-11-18 | 曾维 | Projector type automatic dustproof system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108992862A (en) * | 2018-07-25 | 2018-12-14 | 上饶师范学院 | A kind of mine worker physical fitness management system |
| CN108992862B (en) * | 2018-07-25 | 2020-06-05 | 上饶师范学院 | Mine worker is with sports body-building management system |
| CN109507920A (en) * | 2018-11-06 | 2019-03-22 | 南京理工大学常熟研究院有限公司 | It can recognize the projector automatic control device of switch door state |
| CN111557560A (en) * | 2020-05-07 | 2020-08-21 | 浙江荣泰健康电器有限公司 | Application method and equipment of multifunctional massage chair with intelligent cinema system |
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Application publication date: 20180710 |
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