WO2019169819A1 - 可调节投影镜头及投影装置 - Google Patents

可调节投影镜头及投影装置 Download PDF

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Publication number
WO2019169819A1
WO2019169819A1 PCT/CN2018/095507 CN2018095507W WO2019169819A1 WO 2019169819 A1 WO2019169819 A1 WO 2019169819A1 CN 2018095507 W CN2018095507 W CN 2018095507W WO 2019169819 A1 WO2019169819 A1 WO 2019169819A1
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WIPO (PCT)
Prior art keywords
projection lens
channel
adjustable
projection
outlet
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PCT/CN2018/095507
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English (en)
French (fr)
Inventor
周正平
周建华
李屹
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深圳光峰科技股份有限公司
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Publication of WO2019169819A1 publication Critical patent/WO2019169819A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G02B23/08—Periscopes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • 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
    • G03B21/14—Details
    • 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
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • 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
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam
    • 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

Definitions

  • the present invention relates to the field of projection display, and more particularly to an adjustable projection lens and a projection apparatus including the adjustable projection lens.
  • the lens of most projector products on the market is fixed, as shown in Figure 1, that is, the lens and the machine are integrated.
  • the product when looking for the projection wall, it can only move the whole machine. Change the projection direction.
  • the present invention provides an adjustable projection lens with adjustable lens direction and a projection device including an adjustable projection lens.
  • the present invention provides an adjustable projection lens adapted to a projection device, the adjustable projection lens comprising a rotating mechanism, the rotating mechanism comprising a rotatable channel and a reflective unit, the rotatable channel having an inlet and an outlet, the outlet being opposite to the inlet Rotatable, the entrance is used to access the projection light of the projection device; the reflection unit is located in the rotatable channel for reflecting the projected light to form an exit light path and exiting from the exit.
  • the adjustable projection lens further includes an exit projection lens, and the exit projection lens is mounted to the exit.
  • the adjustable projection lens further includes an incident projection lens mounted to the entrance for emitting projected light.
  • the rotatable channel includes a first channel and a second channel that are rotatably connected, the inlet is located at the first channel, the outlet is located at the second channel, and the second channel is rotated at an angle relative to the axis of the first channel. ° to 360°, so that the direction of the outgoing light path is adjustable within 360° with respect to the projected light path of the incident projection lens.
  • the first channel and the second channel are L-shaped right angle channels.
  • the reflecting unit comprises a first mirror and a second mirror, the first mirror being located at a right angle of rotation of the first channel and the second mirror being located at a right angle of rotation of the second channel.
  • the adjustable projection lens further includes a control module for issuing a control signal to adjust an orientation of the entrance of the rotating mechanism, and a driving module coupled to the rotating mechanism for driving the rotation in response to the control signal
  • the structure adjusts the orientation.
  • the rotating mechanism further includes: a receiving module and a controller, the receiving module is configured to receive the control signal; the controller is configured to generate a driving signal in response to the control signal, and the driving module is coupled to the controller signal to receive the driving signal.
  • the invention provides a projection apparatus comprising an adjustable projection lens as provided in any of the preceding claims.
  • the projection direction of the adjustable projection lens provided by the invention can be adjusted, and only the rotation mechanism needs to be adjusted, so that the projection direction can be changed, thereby overcoming the large displacement of the projection device when searching for the projection wall surface.
  • the difficulty of the projection device is a simple operation of the projection lens.
  • FIG. 1 is a schematic structural view of a projection apparatus provided by the prior art.
  • FIG 2 is a schematic structural view of a projection apparatus according to a first embodiment of the present invention (including an adjustable projection lens).
  • FIG. 3 is a schematic structural diagram of an adjustable projection lens according to a second embodiment of the present invention.
  • FIG. 4 is a schematic structural view of an adjustable projection lens according to a third embodiment of the present invention.
  • a projection apparatus 100 includes a host 10 and an adjustable projection lens 1 .
  • the main body 10 has a front side 101 facing the projection surface or the projection screen, and the adjustable projection lens 1 is mounted on the front side 101.
  • the adjustable projection lens 1 includes a rotating mechanism 30.
  • the rotating mechanism 30 includes a rotatable passage 40 and a reflecting unit 50 located within the rotatable passage 40.
  • the rotary passage 40 has an inlet 411 and an outlet 421, and the outlet 421 is rotatable relative to the inlet 411 to adjust the final exit direction of the projection optical path L1.
  • the entrance 411 is used to access the projected light of the host 10.
  • the reflecting unit 50 is configured to form an outgoing light path L3 after reflecting the projected light in the rotatable channel 40. Since the outlet 421 can rotate relative to the inlet 411, the projection direction of the projection light path can be changed by adjusting the angle of the projection lens 1, so that the projection direction can be changed without moving the host 10.
  • the rotatable channel 40 includes a first channel 41 and a second channel 42 that are rotatably connected.
  • the inlet 411 is located at the connection end of the first channel 41 and the host 10, and the outlet 421 is located at the light exiting side of the second channel 42.
  • the first passage 41 is connected to the main body 10 at its inlet 411.
  • the second passage 42 is rotatable relative to the first passage 41 about the central axis of the first passage 41, and the rotation angle is 0° to 360°. With the rotation between the two passages, the exit optical path L3 is opposite to the projection optical path L1 at 360.
  • the release adjustment is performed in the range of °, for example, the exiting optical path L3 and the projection optical path L1 are parallel, that is, the emission direction is adjusted by 0°; for example, the outgoing optical path L3 and the projection optical path L1 are perpendicular (the outgoing optical path L3 is orthographically projected on the projected optical path)
  • the plane in which L1 is located is compared), that is, the exit direction is adjusted by 90°; for example, the exit light path L3 and the projection light path L1 are parallel but opposite in direction, that is, the exit direction is adjusted by 180°.
  • the exiting optical path L3 can also be in the same direction as the projection optical path L1 after being adjusted by 360°.
  • the reflection unit 50 includes a first mirror 51 and a second mirror 52.
  • the first mirror 51 is located in the first passage 41 and the second mirror 52 is located in the second passage 42.
  • the first mirror 51 reflects the projection light path L1 into the second channel 42, and the second mirror 52 reflects the reflected light of the first mirror 51 to the outlet 421.
  • the first channel 41 and the second channel 42 are both L-shaped right-angle channels, and the first mirror 51 and the second mirror 52 are respectively disposed at right angles 410 and 420, and the reflection surface of the first mirror 51
  • the projection lens 20 is incident toward the projection lens path L1 at an angle of 45°.
  • the reflection surface of the second mirror 52 and the reflection light path L2 of the first mirror 51 are at an angle of 45°, and the reflection light path L2 is reflected by the second mirror 52 to form an exit light path L3.
  • the right angle corner 410 and the right angle corner 420 make the exit light path L3 and the projection light path L1 parallel.
  • the final exit optical path L3 and the projection optical path L1 may be at an angle, for example, 30°, 60°, 90°, and the like.
  • the shape and bending angle of the first passage 41 and the second passage 42 may also vary.
  • the first passage 41 and the second passage 42 are coupled to each other by a rotary joint 43.
  • the rotary joint 43 and the second passage 42 are fixedly coupled, and the rotary joint 43 is screwed to the first passage 41 to drive the second passage 42 to rotate 360 degrees around the central axis of the first passage 41.
  • connection manner of the rotary joint 43 with the first passage 41 and/or the second passage 42 is not limited to the above manner, and the effect of enabling the 360° rotation of the second passage 42 around the central axis of the first passage 41 can be ensured.
  • the implementation can be either.
  • the outgoing light path L3 is higher than the height of the host 10.
  • the adjustable projection lens 1 changes the initial projection direction of the host 10 by rotating the rotating mechanism 30 disposed outside the host 10, so that the projection direction can be adjusted without moving the heavy host 10. purpose.
  • the adjustable projection lens 2 provided in this embodiment is substantially the same as the adjustable projection lens 1 provided in the first embodiment (for the description of the projection device and the host in the figure, refer to the first embodiment),
  • the lens group 60 includes a convex lens 61 which is located between the inlet 411 and the first reflecting mirror 51.
  • the convex lens 61 is used to condense the projected light.
  • the lens group 60 further includes a first relay lens (relay lens) 62 and a second relay lens 63, the first relay lens 62 is located between the convex lens 61 and the first mirror 51, and the second relay lens 63 is located at the first mirror 51.
  • the adjustable projection lens 2 provided by the embodiment can change the direction of the outgoing light path by the rotating mechanism, and does not need to move the host, but also provides the lens group 60 to concentrate the projection light in the rotating mechanism for transmission and realization. Clearer projection effect.
  • the adjustable projection lens 2 may further include an exit projection lens 64 and/or an incident projection lens 20, that is, the adjustment projection lens 2 may include only the exit projection lens 64, or only the incident projection lens 20, or both.
  • the projection lens 64 also includes an incident projection lens 20.
  • the rotating mechanism 30 is attached to the incident projection lens 20.
  • the incident projection lens 20 is mounted at the inlet 411 (shown in an unmounted state).
  • the exit projection lens 64 is disposed at the exit light path L3 and is attached to the outlet 421.
  • the incident projection lens 20 and the exit projection lens 64 are internally provided with projection lenses, and the structures can be the same.
  • the presence or absence of the incident projection lens 20, the exit projection lens 64, and the lens group 60 and the specific positions are set according to actual needs to obtain a better projection picture.
  • the adjustable projection lens 3 provided by the embodiment further includes a control module 71 and a driving Module 74.
  • the control module 71 is operative to issue a control signal to adjust the orientation of the outlet 421 of the rotating mechanism 30.
  • the drive module 74 is coupled to the rotating mechanism 30 for actuating the rotating mechanism 30 to adjust orientation in response to a control signal.
  • the control module 71 can be a separate remote controller and wirelessly connected to the rotating mechanism 30.
  • the wireless communication protocol between the two is infrared, Wi-Fi or Bluetooth.
  • the driving module 74 includes a driving chip 741 and a motor 742.
  • the motor 742 and the driving chip 741 are connected by a signal, and the signal connection is a wired connection or a wireless connection.
  • the second passage 42 rotates relative to the first passage 41, and the motor 742 is mechanically coupled to the second passage 42. More specifically, since the rotary joint 43 drives the second passage 42 to rotate, the motor 742 and the rotary joint 43 are mechanically coupled.
  • control signal is an electromagnetic wave of a preset duration
  • driving signal is a preset number of pulse signals
  • driving chip 741 is configured to provide a voltage signal of a preset duration to the motor 742 according to a preset number of pulse signals
  • the motor 742 The second channel 42 is driven to rotate the preset angle according to the voltage signal of the preset duration.
  • the rotating mechanism 30 may further include a receiving module 72 and a controller 73.
  • the receiving module 72 is configured to receive a control signal sent by the control module 71.
  • the controller 73 is responsive to the control signal to issue a drive signal.
  • the controller 73 can be an MCU (Micro Controller Unit, also known as a Single Chip Microcomputer, a single-chip microcomputer).
  • the drive module 74 and the controller 73 are signally connected, that is, include a wired or wireless connection.
  • the receiving module 72 receives the electromagnetic wavelength ⁇ and the duration tx sent to the control module 71, and the receiving module 72 feeds back the electromagnetic wavelength ⁇ value and the duration tx to
  • the controller 73 sends a corresponding number (m) of pulses to the motor 742 according to the two values, and the driving chip 741 supplies the motor 742 with a duration t according to the number m of pulses received.
  • the motor 742 is rotated by a gamma angle, so that the rotary joint 43 automatically rotates by a corresponding angle ⁇ , thereby causing the second passage 42 to rotate to the desired projection direction.
  • the receiving module 72 receives the electromagnetic wave having the electromagnetic wavelength ⁇ for a duration T1
  • the corresponding motor 742 rotates by a corresponding angle ⁇ 1
  • the driving voltage duration of the corresponding driving chip 741 is t1
  • the corresponding controller 73 drives the driving chip 741.
  • the number of pulses sent is m1.
  • the corresponding motor 742 rotates by a corresponding angle ⁇ 2, and the driving voltage duration of the corresponding driving chip 741 is t2, and the corresponding controller 73 drives the driving chip 741.
  • the number of pulses sent is m2.
  • the corresponding motor 742 rotates by a corresponding angle ⁇ 3, and the driving voltage duration of the corresponding driving chip 741 is t3, and the corresponding controller 73 drives the driving chip 741.
  • the number of pulses sent is m3...like analogy.
  • the controller 73 When the receiving module 72 receives the electromagnetic wave duration Tx sent by the control module 71 and sends it to the controller 73, the controller 73 according to this value needs to send M pulses to the driving chip 741, and the driving chip 741 sends the motor to the motor according to the number of pulses M.
  • the 742 continues to provide the driving voltage V for a duration T, so that the driving motor 742 rotates by a corresponding angle ⁇ , thereby controlling the rotary joint 43 to rotate by the ⁇ angle.
  • the adjustable projection lens 3 provided in this embodiment can control the projection switching device 71 through the control module 71, and cooperate with the receiving module 72, the controller 73 and the driving module 74 on the rotating mechanism 30 to rotate the rotary joint 43.
  • the angle i.e., the angle of rotation of the second passage 42 relative to the first passage 41
  • the adjustable projection lens 3 does not have to be manually adjusted directly.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Projection Apparatus (AREA)

Abstract

一种可调节投影镜头（1），适配于投影装置（100），可调节投影镜头包括旋转机构（30），旋转机构（30）包括可旋转通道（40）及反射单元（50），可旋转通道（40）具有入口（411）和出口（421），出口（421）相对入口（411）可旋转，入口（411）用于接入投影装置（100）的投影光线；反射单元（50）位于可旋转通道（40）内，用于反射投影光线以形成出射光路（L3）并自出口（421）射出。可调节投影镜头（1）的投影方向可以调节，从而克服投影装置在寻找投射墙面时，需要人为挪动产品等技术问题，只需要调整可调节投影镜头（1）的出口朝向，即可改变投影方向。

Description

可调节投影镜头及投影装置 技术领域
本发明涉及投影显示领域，尤其涉及一种可调节投影镜头及包括可调节投影镜头的投影装置。
背景技术
目前，市面上大多数的投影仪产品的镜头为固定式，如图1所示，即镜头和机器为一体式，产品在使用过程中，当寻找投影墙面时，只能通过挪动整台机器改变投影方向。
发明内容
鉴于上述情况，本发明提出一种镜头方向能够调节的可调节投影镜头以及包括可调节投影镜头的投影装置。
第一方面，本发明提供一种可调节投影镜头，适配于投影装置，可调节投影镜头包括旋转机构，旋转机构包括可旋转通道及反射但单元，可旋转通道具有入口和出口，出口相对入口可旋转，入口用于接入投影装置的投影光线；反射单元位于可旋转通道内，用于反射投影光线以形成出射光路并自出口射出。
在一种实施方式中，可调节投影镜头还包括出射投影镜头，出射投影镜头安装于出口。
在一种实施方式中，可调节投影镜头还包括入射投影镜头，入射投影镜头安装于入口，用于发出投影光线。
在一种实施方式中，可旋转通道包括旋转连接的第一通道和第二通道，入口位于第一通道，出口位于第二通道，第二通道相对第一通道中轴线发生旋转 的角度范围为0°到360°，以使出射光路的方向相对入射投影镜头的投影光路在360°范围内可调。
在一种实施方式中，第一通道和第二通道为L型直角通道。
在一种实施方式中，反射单元包括第一反射镜和第二反射镜，第一反射镜位于第一通道的直角转角，第二反射镜位于第二通道的直角转角。
在一种实施方式中，投影转接装置还包括透镜组，透镜组位于入射投影镜头可旋转通道内，用于使可调节投影镜头的物距u、焦距f、像距v满足以下关系：1/u+1/v＝1/f。
在一种实施方式中，可调节投影镜头还包括控制模块和驱动模块，控制模块用于发出控制信号以调节旋转机构的入口的朝向；驱动模块与旋转机构连接，用于响应控制信号以驱动旋转结构调节朝向。
在一种实施方式中，旋转机构还包括：接收模块和控制器，接收模块用于接收控制信号；控制器用于响应控制信号以发出驱动信号，驱动模块与控制器信号连接，以接收驱动信号。
第二方面，本发明提供一种投影装置，包括如前述任一项提供的可调节投影镜头。
相较于现有技术，本发明提供的可调节投影镜头的投影方向可以调节，只需要调整旋转机构，即可改变投影方向，从而克服投影装置在寻找投射墙面时，需要人为挪动体积较大的投影装置的困难。
本发明的这些方面或其他方面在以下实施例的描述中会更加简明易懂。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所 需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术提供的投影装置的结构示意图。
图2是本发明第一实施例提供的投影装置的结构示意图(含可调节投影镜头)。
图3是本发明第二实施例提供的可调节投影镜头的结构示意图。
图4是本发明第三实施例提供的可调节投影镜头的结构示意图。
具体实施方式
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
第一实施例
请参阅图2，本发明第一实施例提供的投影装置100包括主机10以及可调节投影镜头1。主机10具有朝向投影面或投影幕布的正面101，可调节投影镜头1安装在正面101。
可调节投影镜头1包括旋转机构30。旋转机构30包括可旋转通道40和位于可旋转通道40内的反射单元50。
旋转通道40具有入口411和出口421，出口421相对入口411可旋转以调 节投影光路L1的最终出射方向。入口411用于接入主机10的投影光线。
反射单元50用于在可旋转通道40内反射投影光线后形成出射光路L3。由于出口421可相对入口411发生旋转，投影光路的投射方向可以通过可调节投影镜头1的角度调节而发生变化，从而不必挪动主机10，即可改变投影方向。
在本实施例中，可旋转通道40包括旋转连接的第一通道41和第二通道42，入口411位于第一通道41与主机10的连接端，出口421位于第二通道42的出光侧。第一通道41在其入口411处和主机10进行连接。
第二通道42相对第一通道41可绕第一通道41的中轴线发生旋转，旋转角度为0°到360°，随着两个通道之间的旋转，出射光路L3相对投影光路L1在360°范围内进行放行调整，例如，出射光路L3和投影光路L1平行，即出射方向调整了0°；又例如，出射光路L3和投影光路L1垂直(将出射光路L3正投影在投影光路L1所在的平面进行比较)，即出射方向调整了90°；再例如，出射光路L3和投影光路L1平行但方向相反，即出射方向调整了180°。另外，出射光路L3还可以在调整360°后和投影光路L1同向。
在本实施例中，反射单元50包括第一反射镜51和第二反射镜52。第一反射镜51位于第一通道41，第二反射镜52位于第二通道42。第一反射镜51将投影光路L1反射到第二通道42内，再由第二反射镜52将第一反射镜51的反射光线反射到出口421。
在本实施例中，第一通道41和第二通道42均呈L型直角通道，第一反射镜51和第二反射镜52分别设置在直角转角410、420，第一反射镜51的反射面朝向入射投影镜头20，并和投影光路L1呈45°角。第二反射镜52的反射面和第一反射镜51的反射光路L2呈45°夹角，反射光路L2经过第二反射镜52的反射后形成出射光路L3。直角转角410和直角转角420使得出射光路L3和投影 光路L1平行。
在其他实施方式中，也可以设置其他具体结构的反射单元，最终的出射光路L3和投影光路L1可以成一定角度，例如30°，60°，90°等。
在其他实施方式中，第一通道41和第二通道42的形状和弯折角度也可以改变。
在本实施例中，第一通道41和第二通道42通过旋转接头43相互衔接。旋转接头43和第二通道42固定连接，旋转接头43和第一通道41螺纹连接，以带动第二通道42绕第一通道41的中心轴线进行360°旋转。可以理解，旋转接头43与第一通道41和/或第二通道42的连接方式不局限于上述方式，在能够保证能够实现第二通道42绕第一通道41的中心轴线进行360°旋转的效果的实施方式均可。
为了使出射光路L3无障碍，出射光路L3高于主机10的高度。
综上，本实施例提供的可调节投影镜头1通过旋转设置在主机10外部的旋转机构30来改变主机10初始的投影方向，从而达到不用搬动较重的主机10，即可调整投影方向的目的。
第二实施例
请参阅图3，本实施例提供的可调节投影镜头2和第一实施例提供的可调节投影镜头1基本相同(对图中的投影装置及主机的说明可参阅第一实施例)，不同之处在于，旋转机构30还进一步包括透镜组60，透镜组60位于可旋转通道40内，用于使可调节投影镜头2的物距u、焦距f、像距v满足以下关系：1/u+1/v＝1/f。
具体地，透镜组60包括凸透镜61，所述凸透镜61位于入口411和第一反 射镜51之间。凸透镜61用于会聚投影光线。
透镜组60还包括第一继透镜(中继透镜)62和第二继透镜63，第一继透镜62位于凸透镜61和第一反射镜51之间，第二继透镜63位于第一反射镜51的反射光路L2，即位于第一反射镜51和第二反射镜52之间，以使物距u、焦距f、像距v满足以下关系：1/u+1/v＝1/f，以获得更清晰的投影画面。需要说明的是，当采用透镜组时，物距u、焦距f、像距v满足成像关系：1/u+1/v＝1/f，相关参数如物距u、焦距f、像距v均为透镜组的等效参数；透镜组的设置还可以进一步考虑出射投影镜头64和/或入射投影镜头20的相关参数，本领域技术人员可以根据具体需要调整相关参数，满足成像条件即可。
综上，本实施例提供的可调节投影镜头2除了可以通过旋转机构改变出射光路的方向，不必挪动主机之外，还通过设置透镜组60使投影光线能够集中在旋转机构中进行传输并实现较清晰的投影效果。
进一步地，可调节投影镜头2还可以进一步包括出射投影镜头64和/或入射投影镜头20，即可调节投影镜头2可以只包括出射投影镜头64，或者只包括入射投影镜头20，或者既包括出射投影镜头64，也包括入射投影镜头20。旋转机构30与入射投影镜头20连接安装。
入射投影镜头20安装在入口411(图示为未安装的状态)。出射投影镜头64设置在出射光路L3，安装在出口421。入射投影镜头20和出射投影镜头64内部设有投影镜片，结构可以相同。入射投影镜头20、出射投影镜头64和透镜组60的有无及具体位置均根据实际需要设置，以获得较佳的投影画面为宜。
第三实施例
请一并参阅图2和图4，或者参阅图3和参阅图4，在本发明第一或第二实 施例的基础上，本实施例提供的可调节投影镜头3还包括控制模块71以及驱动模块74。
控制模块71用于发出控制信号来调节旋转机构30的出口421的朝向。
驱动模块74与旋转机构30连接，用于响应控制信号以驱动旋转机构30调节朝向。
控制模块71可以为一个独立的遥控器，与旋转机构30无线连接，二者之间的无线通信协议为红外、Wi-Fi或蓝牙。
在本实施例中，驱动模块74包括驱动芯片741和电机742，电机742和驱动芯片741信号连接，信号连接的方式为有线连接或者无线连接。本实施例中，第二通道42相对第一通道41旋转，电机742与第二通道42机械连接。更具体地，由于旋转接头43驱动第二通道42旋转，因此电机742和旋转接头43机械连接。
在本实施例中，控制信号为预设时长的电磁波，驱动信号为预设数量的脉冲信号，驱动芯片741用于根据预设数量的脉冲信号向电机742提供预设时长的电压信号，电机742用于根据预设时长的电压信号驱动第二通道42旋转预设角度。
更具体地，旋转机构30还可以包括接收模块72和控制器73。接收模块72用于接收控制模块71发出的控制信号。控制器73用于响应控制信号以发出驱动信号。控制器73可以是MCU(Micro Controller Unit,微控制单元，又称Single Chip Microcomputer，单片微型计算机)。驱动模块74和控制器73信号连接，即包括有线或者无线连接方式。
具体地，当可调节投影镜头3启动上电后，接收模块72通过接收到控制模块71向其发送的电磁波长λ及持续时间tx，接收模块72将这个电磁波长λ值 和持续时间tx反馈给控制器73，控制器73根据这两个值，向驱动芯片741向电机742发出相应数量(m)的脉冲，驱动芯片741根据接收到的脉冲数量m，向电机742提供一个持续时间为t的电压，电机742相应旋转一个γ角度，从而旋转接头43自动旋转相应的角度γ，进而使得第二通道42旋转到所需投射的方向。
以下介绍控制信号和旋转角度的对应关系的建立。
设当接收模块72接收到电磁波长为λ的电磁波，持续时间为T1时，对应电机742旋转相应的角度γ1，对应驱动芯片741提供的驱动电压持续时间为t1，对应控制器73向驱动芯片741发送的脉冲数量为m1。
当接收模块72接收到的电磁波长为λ的电磁波，持续时间为T2时，对应电机742旋转相应的角度γ2，对应驱动芯片741提供的驱动电压持续时间为t2，对应控制器73向驱动芯片741发送的脉冲数量为m2。
当接收模块72接收到的电磁波长为λ的电磁波，持续时间为T3时，对应电机742旋转相应的角度γ3，对应驱动芯片741提供的驱动电压持续时间为t3，对应控制器73向驱动芯片741发送的脉冲数量为m3……以为类推。
将以上数据统计并记录下来，然后推算出电磁波持续时间Tx和m之间的线性关系，m＝K*tx，K为比例常数，将该关系式写成相应的程序并烧入到控制器73中，当接收模块72接收到控制模块71发送的电磁波持续时间Tx并发送给控制器73时，控制器73根据这个值推出需要向驱动芯片741发送M个脉冲，驱动芯片741根据脉冲数量M向电机742持续提供驱动电压V，持续时间为T，从而驱动电机742旋转相应的角度γ，进而控制旋转接头43旋转γ角度。
综上，本实施例提供的可调节投影镜头3可通过控制模块71对投影转接装置71进行控制，配合旋转机构30上的接收模块72、控制器73和驱动模块74 对旋转接头43的旋转角度(亦即第二通道42相对第一通道41的旋转角度)进行精细化调整，且不必直接手动调节可调节投影镜头3。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种可调节投影镜头，适配于投影装置，其特征在于，所述可调节投影镜头包括旋转机构，所述旋转机构包括：
    可旋转通道，具有入口和出口，所述出口相对所述入口可旋转，所述入口用于接入所述投影装置的投影光线；以及
    反射单元，位于所述可旋转通道内，用于反射所述投影光线以形成出射光路并自所述出口射出。
  2. 如权利要求1所述的可调节投影镜头，其特征在于，所述可调节投影镜头还包括出射投影镜头，所述出射投影镜头安装于所述出口。
  3. 如权利要求1或2所述的可调节投影镜头，其特征在于，所述可调节投影镜头还包括入射投影镜头，所述入射投影镜头安装于所述入口，用于发出所述投影光线。
  4. 如权利要求1所述的可调节投影镜头，其特征在于，所述可旋转通道包括旋转连接的第一通道和第二通道，所述入口位于所述第一通道，所述出口位于所述第二通道，所述第二通道相对所述第一通道中轴线发生旋转的角度范围为0°到360°，以使所述出射光路的方向相对所述入射投影镜头的投影光路在360°范围内可调。
  5. 如权利要求4所述的可调节投影镜头，其特征在于，所述第一通道和所述第二通道为L型直角通道。
  6. 如权利要求5所述的可调节投影镜头，其特征在于，所述反射单元包括第一反射镜和第二反射镜，所述第一反射镜位于所述第一通道的直角转角，所述第二反射镜位于所述第二通道的直角转角。
  7. 如权利要求1所述的可调节投影镜头，其特征在于，所述投影转接装置还包括透镜组，所述透镜组位于所述可旋转通道内，用于使所述可调节投影镜头的物距u、焦距f、像距v满足以下关系：1/u+1/v＝1/f。
  8. 如权利要求1所述的可调节投影镜头，其特征在于，所述可调节投影镜头还包括：
    控制模块，用于发出控制信号以调节所述旋转机构的出口的朝向；以及
    驱动模块，与所述旋转机构连接，用于响应所述控制信号以驱动所述旋转机构调节朝向。
  9. 如权利要求8所述的可调节投影镜头，其特征在于，所述旋转机构还包括：
    接收模块，用于接收所述控制信号；以及
    控制器，用于响应所述控制信号以发出驱动信号，所述驱动模块与所述控制器信号连接。
  10. 一种投影装置，其特征在于，包括如权利要求1～9任一项所述的可调节投影镜头。
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