Head-mounted device and imaging projection module therefor
A head-mounted device includes goggles and an image projection module. The image projection module includes a housing fixed on the goggles, an optical element, a projector fixed on the housing and a reflective element disposed within the housing. The housing defines a channel and first and second channel openings. The projector is configured to project an image light beam toward the optical element located in the channel through first and second optical surfaces of the optical element sequentially. The reflective element is configured to receive the image light beam and reflect the received image light beam to generate a reflected light beam directed to the second optical surface. The optical element is configured to refract the reflected light beam toward a lens of the goggles to generate a refracted light beam leaving the channel from the first channel opening and passing through the lens for forming an image.
1 . A head-mounted device, comprising:
a goggle having a frame and a lens, wherein the frame defines an opening, and the lens is mounted on the opening; and
an image projection module, comprising:
a housing fixed on the goggles and defining a channel, a first channel opening and a second channel opening, wherein the channel is between the first channel opening and the second channel opening, and the first channel opening is adjacent to the opening;
an optical element located on the channel and having a first optical surface and a second optical surface;
a projector fixed on the housing and configured to project an image light beam toward the optical element, such that the image light beam passes through the first optical surface and the second optical surface sequentially; and
a reflective element disposed in the housing and configured to receive the image light beam passing through the first optical surface and the second optical surface and reflect the received image light beam to generate a reflected light beam directed to the second optical surface, wherein the optical element is configured to refract the reflected light beam toward the lens to generate a refracted light beam, such that the refracted light beam leaves the channel from the first channel opening and passes through the lens for forming an image, wherein:
the housing has a top wall, a bottom wall, a first side wall and a second side wall, and the top wall, the bottom wall, the first side wall and the second side wall are connected to each other to define the channel, the first channel opening and the second channel,
the projector is fixed on the top wall,
the reflective element is disposed on the bottom wall, and
the channel is located between the projector and the reflective element.
2 . The head-mounted device of claim 1 , wherein:
the housing further has a first extension wall connected between the bottom wall, the first side wall and the second side wall, and the first extension wall, the bottom wall, the first side wall and the second side wall define a first containing space, and the reflective element is located in the first containing space.
3 . The head-mounted device of claim 2 , wherein the optical element is a flat-plate beam splitter and has at least one side fixed on the first extension wall.
4 . The head-mounted device of claim 3 , wherein:
an angle is formed between the first optical surface and the second channel opening, and the angle is within a range between 10 degrees and 85 degrees.
5 . The head-mounted device of claim 4 , wherein the reflective element has a reflective curved surface configured to receive the image light beam passing through the first optical surface and the second optical surface and reflect the received image light beam to generate the reflected light beam directed to the second optical surface.
6 . The head-mounted device of claim 2 , wherein:
the housing further has a second extension wall connected between the top wall, the first side wall and the second side wall,
the second extension wall, the top wall, the first side wall and the second side wall define a second containing space, and at least one portion of the projector is located in the second containing space, and
the second channel opening is defined between the first extension wall and the second extension wall.
7 . The head-mounted device of claim 1 , wherein:
the image projection module further includes at least one connection element disposed on at least one of the top wall, the bottom wall, the first side wall and the second side wall and configured to connect the frame to fix the housing on the goggles.
8 . The head-mounted device of claim 1 , further comprising:
a processor electrically connected to the projector and configured to generate information, wherein the projector generates the image light beam according to the information, such that the information is shown in the image.
9 . The head-mounted device of claim 8 , further comprising:
a sensor electrically connected to the processor and configured to sense physical quantity of an external environment and transmit the physical quantity to the processor, wherein the processor is further configured to generate the information according to the physical quantity.
10 . The head-mounted device of claim 8 , further comprising:
a camera module electrically connected to the processor and configured to capture an image and transmit the image to the processor, wherein the processor is further configured to generate the information according to the image.
11 . The head-mounted device of claim 8 , further comprising:
a communication module electrically connected to the processor and configured to receive a wireless signal, convert the wireless signal to an electronic signal and transmit the electronic signal to the processor, wherein the processor is further configured to generate the information according to the electronic signal.
12 . An image projection module mounted on a head-mounted device, the head-mounted device having goggles, and the image projection module comprising:
a housing having a top wall, a bottom wall, a first side wall and a second side wall, and the top wall, the bottom wall, the first side wall and the second side wall are connected to each other to define a channel, a first channel opening and a second channel opening, wherein the channel is between the first channel opening and the second channel opening, and the first channel opening is adjacent to the opening;
at least one connection element disposed on at least one of the top wall, the bottom wall, the first side wall and the second side wall, and configured to connect a frame of the goggles to fix the housing on the goggles;
an optical element located on the channel and having a first optical surface and a second optical surface;
a projector fixed on the housing and configured to project an image light beam toward the optical element, such that the image light beam passes through the first optical surface and the second optical surface sequentially; and
a reflective element disposed in the housing and configured to receive the image light beam passing through the first optical surface and the second optical surface and reflect the received image light beam to generate a reflected light beam directed to the second optical surface, wherein the optical element is configured to refract the reflected light beam toward the lens to generate a refracted light beam, such that the refracted light beam leaves the channel from the first channel opening and passes through the lens for forming an image, wherein:
the projector is fixed on the top wall,
the reflective element is disposed on the bottom wall, and
the channel is located between the projector and the reflective element.
13 . The image projection module of claim 12 , wherein:
the housing further has a first extension wall and a second extension wall,
the first extension wall is connected between the bottom wall, the first side wall and the second side wall,
the second extension wall is connected between the top wall, the first side wall and the second side wall,
the second passage opening is defined between the first extension wall and the second extension wall,
the first extension wall, the bottom wall, the first side wall and the second side wall define a first containing space, and the reflective element is located in the first containing space,
the second extension wall, the top wall, the first side wall and the second side wall define a second containing space, and at least one part of the projector is located in the second containing space,
the optical element is a flat-plate beam splitter and has at least one side fixed on the first extension wall, and
an angle is formed between the first optical surface and the second channel opening, and the angle is between 10 degrees and 85 degrees.
14 . The image projection module of claim 13 , wherein the reflective element has a reflective curved surface configured to receive the image light beam passing through the first optical surface and the second optical surface and reflect the received image light beam to generate the reflected light beam directed to the second optical surface.
15 . The image projection module of claim 12 , further comprising:
a processor electrically connected to the projector and configured to generate information, wherein the projector generates the image light beam according to the information, such that the information is shown in the image.
16 . The image projection module of claim 15 , further comprising:
a sensor electrically connected to the processor and configured to sense physical quantity of an external environment and transmit the physical quantity to the processor, wherein the processor is further configured to generate the information according to the physical quantity.
17 . The image projection module of claim 15 , further comprising:
a camera module electrically connected to the processor and configured to capture an image and transmit the image to the processor, wherein the processor is further configured to generate the information according to the image.
18 . The image projection module of claim 15 , further comprising:
a communication module electrically connected to the processor and configured to receive a wireless signal, convert the wireless signal to an electronic signal and transmit the electronic signal to the processor, wherein the processor is further configured to generate the information according to the electronic signal.