JP2019015863A - Projection type display device - Google Patents

Abstract

To provide projection type display device that can prevent a user from leaving a lens unit unfixed during replacement of the lens unit.SOLUTION: A projection type display device (100) with a replaceable lens unit (200) comprises: fixing means (114) that fixes the lens unit; detection means (115) that detects the fixed state of the lens unit; and control means (107) that performs control according to an output signal from the detection means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection display device in which a lens can be exchanged.

  Patent Document 1 discloses a lens-interchangeable projection display device. The lens-interchangeable projection display device can be used in various scenes such as an event because the projection lens can be exchanged according to a projection distance such as a near projection distance or a far projection distance.

JP 2014-137513 A

  By the way, in the lens-interchangeable projection display device as disclosed in Patent Document 1, if the projection lens is forgotten to be fixed after being inserted into the main body of the projection display device, the optical path is changed and projected. May affect the image. However, it is possible to project an image without fixing the projection lens. In addition, since the projection type display device is not used so as to frequently look around the lens once installed, the user does not notice that the projection lens is forgotten to be fixed, and may continue to be used in a non-best state. . Further, in the system in which the projection lens fixing part is a separate body such as the spigot system, the above-mentioned concern is increased.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a projection display device capable of reducing forgetting to fix a lens when a lens unit is replaced.

  A projection display device according to one aspect of the present invention is a projection display device in which a lens unit can be replaced, and a fixing unit that fixes the lens unit, a detection unit that detects a fixing state of the lens unit, Control means for performing control according to the output signal of the detection means.

  Other objects and features of the invention are described in the following embodiments.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type display apparatus which can reduce forgetting fixing of the lens at the time of lens unit replacement | exchange can be provided.

It is a block diagram of the projection type display apparatus in this embodiment. It is a block diagram of the fixing mechanism of the lens unit in this embodiment. It is a flowchart which shows the control method at the time of lens unit replacement | exchange in this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, a projection type display device (projector) in this embodiment will be described with reference to FIG. FIG. 1 is a block diagram of the projection display device 100. The projection display device (main body) 100 can be attached with a lens unit (projection lens unit) 200 in a replaceable manner.

  The image signal input unit 101 includes an image signal input interface connector and inputs an image signal from an external device. The image signal input to the image signal input unit 101 is output to the image signal processing unit 102. The image signal processing unit 102 performs various signal processes such as image correction including keystone correction, scaling, brightness correction, contrast correction, and color correction. The image signal output from the image signal processing unit 102 is output to the panel drive unit 103. The panel drive unit 103 drives the liquid crystal panel 104 based on the image signal output from the image signal processing unit 102. The liquid crystal panel 104 may be either a transmissive liquid crystal panel or a reflective liquid crystal panel. Further, a display element having a liquid crystal panel or higher may be used. Light emitted from the light source 105 is image-modulated by the liquid crystal panel 104 and projected onto a projection surface such as a screen by a lens (projection lens) 201.

  The MPU (main body MPU) 107 is a control unit that controls each unit of the projection display apparatus 100. The light source driving unit 108 performs light source driving such as turning on / off the light source 105 and keeping power supplied to the light source 105 constant based on a command from the MPU 107. The MPU 107 reads a user operation input to the operation unit 109 and performs an operation according to the user operation. The display unit 110 is a notification unit that notifies the user of the current state of the projection display apparatus 100 according to an instruction from the MPU 107. The display unit 110 includes, for example, an LED for indicating a standby state, an LED for indicating a power-on state, and an LED for indicating a warning state. The MPU 107 controls the LEDs according to the state of the projection display device 100.

  The lens power supply (lens power supply means) 111 supplies power to the lens MPU 202 in the lens unit (interchangeable lens unit) 200. The lens MPU 202 controls the lens driving unit 203 in accordance with a command from the MPU 107. For example, the lens driving unit 203 moves the lens 201 to adjust focus and zoom.

  The pressing unit 114 is a fixing unit that mechanically fixes the lens unit 200 to the projection display device 100. After the lens unit 200 is inserted into the projection display device 100, the pressing unit 114 is operated to complete the fixing of the lens unit 200 to the projection display device 100.

  The pressing unit operation detection unit 115 is a detecting unit that detects whether or not the lens unit 200 is fixed, that is, whether or not the lens unit 200 is fixed to the projection display device 100. The detection result (output signal indicating the detection result) of the pressing unit operation detection unit 115 is output to the MPU 107. The pressing unit operation detection unit 115 is, for example, a mechanical switch (mechanical switch). In this case, the pressing portion operation detection unit 115 is configured such that the switch is operated in conjunction with the operation of the pressing unit 114, and detects the operation of the pressing unit 114 based on the output of the switch. Alternatively, the pressing unit operation detection unit 115 includes a light emitting element and a light receiving element. In this case, the operation of the pressing portion 114 and the amount of light output from the light emitting element and input to the light receiving element are interlocked, and the operation of the pressing portion 114 is detected by the output of the light receiving element. Or the press part operation detection part 115 has a magnet (magnetism generation means) and a magnetic detection element (magnetism detection means). The operation of the pressing unit 114 and the magnetic force output from the magnet and input to the magnetic detection element are interlocked, and the operation of the pressing unit 114 is detected by the output of the magnetic detection element.

  Next, with reference to FIG. 2, the fixing mechanism (spigot type fixing mechanism) of the lens unit 200 in the present embodiment will be described. FIG. 2 is a configuration diagram of a fixing mechanism of the lens unit 200.

  The lens unit 200 has a flange portion 205 and a projection portion 206. The projection display device 100 includes a base part 151, a pressing part 114, a pressing part operation lever 152, a pressing part operation detection part 115, and a nail 153. The flange portion 205 protrudes in a circular shape from the outer peripheral surface of the lens barrel portion of the lens unit 200 and faces the base portion 151. The protruding portion 206 protrudes from the outer peripheral surface of the flange portion 205. In the present embodiment, the protrusions 206 are arranged at intervals of 90 degrees in the circumferential direction. The base 151 is a member that serves as a base when the lens unit 200 is fixed to the projection display device 100, and has a surface orthogonal to the optical axis of the lens 201.

The pressing portion 114 is disposed on the base portion 151 so as to be rotatable about the optical axis. The claw 153 is disposed in the pressing portion 114, and the lens unit 200 is fixed by the claw 153 engaging with the protrusion 206 of the lens unit 200. The pressing portion operation lever 152 rotates the pressing portion 114 when one end of the pressing portion operation lever 152 is pivotally supported by the pressing portion 114 and the other end is operated. The pressing unit operation detection unit 115 is disposed on the base unit 151 and detects an operation of the pressing unit 114. In the present embodiment, the pressing unit operation detection unit 115 is a mechanical switch, and is attached to the base unit 151 so as to be switched by a claw 153 disposed in the pressing unit 114. The pressing unit operation detection unit 115 is turned on / off according to the fixed state of the lens unit 200. That is, the switch is turned off when the lens unit 200 is fixed, and the switch is turned on when the lens unit 200 is released.
Thus, the pressing part 114 fixes the lens unit 200 by a spigot method. In the present embodiment, the pressing unit operation detecting unit 115 detects the position of a spigot type rotating ring (pressing unit 114). However, the present embodiment is not limited to this. For example, the pressing unit operation detection unit 115 may detect the position of the pressing unit operation lever 152 (a lever for operating a spigot type rotating ring). Good.

  Next, a control method at the time of replacement of the lens unit 200 in the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing a control method when the lens unit 200 is replaced. Each step in FIG. 3 is performed by each unit based on a command from the MPU 107.

  First, in step S <b> 101, the MPU 107 determines whether or not the user has operated the pressing unit 114 to complete the fixing of the lens unit 200 to the projection display device 100. That is, the MPU 107 determines the fixed state of the lens unit 200 (whether the lens unit 200 is fixed) based on the output signal (detection signal) of the pressing unit operation detection unit 115. If the lens unit 200 is fixed, step S101 is repeated. On the other hand, if the lens unit 200 is not fixed, the process proceeds to step S102.

  In step S102, the display unit 110 displays a warning according to a command from the MPU 107 and notifies the user that the lens unit 200 is not fixed. Subsequently, in step S103, the MPU 107 stops the command to the lens MPU 202. Subsequently, in step S <b> 104, the MPU 107 turns off the lens power supply 111 and stops supplying power to the lens unit 200.

  As described above, in this embodiment, the MPU 107 performs control according to the output signal of the pressing unit operation detection unit 115. Preferably, the display unit 110 notifies the user of information indicating that the lens unit 200 is not fixed. At this time, when the output signal of the pressing unit operation detection unit 115 is a signal indicating that the lens unit 200 is not fixed, the MPU 107 controls the display unit 110 to notify the user of this information. Preferably, the MPU 107 stops the control of the lens unit 200 when the output signal of the pressing unit operation detection unit 115 is a signal indicating that the lens unit 200 is not fixed. Preferably, the MPU 107 controls the lens power supply 111 so as to stop supplying power to the lens unit 200 when the output signal of the pressing portion operation detection unit 115 is a signal indicating that the lens unit 200 is not fixed. To do.

  The projection display device 100 of the present embodiment has a structure for fixing the lens unit 200 by a spigot method. Therefore, even when the lens unit 200 is not mechanically fixed using the pressing portion 114, electrical connection with the lens unit 200 (communication between the MPU 107 and the lens MPU 202, power supply from the lens power supply 111 to the lens MPU 202). Is possible. Therefore, for example, when steps S103 and S104 of FIG. 3 are not present, the lens unit 200 may be removed in a live line state, and abnormal voltage or abnormal current may flow to the lens unit 200. For this reason, they can be effectively prevented by inserting steps S103 and S104. However, at least one of steps S103 and S104 may be omitted if other methods can be adopted. Further, the MPU 107 may control the light source driving unit 108 to turn off the light source 105 when the output signal of the pressing unit operation detecting unit 115 is a signal indicating that the lens unit 200 is not fixed.

  According to the present embodiment, it is possible to provide a projection display device capable of reducing forgetting to fix the lens unit when the lens unit is replaced.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

107 MPU (control means)
100 Projection Display 114 Pressing Unit (Fixing Unit)
115 Pressing part operation detecting part (detecting means)

Claims (12)

A projection type display device with a replaceable lens unit,
Fixing means for fixing the lens unit;
Detecting means for detecting a fixed state of the lens unit;
Control means for performing control according to the output signal of the detection means. A notification means for notifying a user of information indicating that the lens unit is not fixed;
The control means controls the notifying means to notify the user of the information when the output signal of the detecting means is a signal indicating that the lens unit is not fixed. Item 4. A projection display device according to Item 1.   3. The control unit according to claim 1, wherein the control unit stops the control of the lens unit when the output signal of the detection unit is a signal indicating that the lens unit is not fixed. 4. Projection display device. Further comprising lens power supply means for supplying power to the lens unit;
The control means controls the lens power supply means to stop the supply of the power to the lens unit when the output signal of the detection means is a signal indicating that the lens unit is not fixed. The projection display device according to claim 1, wherein A light source,
5. The control unit according to claim 1, wherein the control unit turns off the light source when the output signal of the detection unit is a signal indicating that the lens unit is not fixed. 6. The projection type display device described in 1.   The projection type display device according to claim 1, wherein the fixing unit fixes the lens unit by a spigot method.   The projection display device according to claim 6, wherein the detection unit detects a position of the spigot type rotating ring.   The projection type display device according to claim 6, wherein the detection unit detects a position of a lever for operating the spigot type rotating ring.   The projection display device according to claim 1, wherein the detection unit is a mechanical switch.   The projection display device according to claim 1, wherein the detection unit includes a light emitting unit and a light receiving unit.   The projection display device according to claim 1, wherein the detection unit includes a magnetic generation unit and a magnetic detection unit.   The projection type display device can be electrically connected to the lens unit even when the lens unit is not fixed using the fixing means. The projection display device according to item.