TW201512763A - Projector - Google Patents

Abstract

A projector comprises a light guiding tube, a reflection element, a lens group, a prism, an image-formed element and a light source. The reflective element has a reflective surface. The lens group is disposed between the light guiding tube and the reflection element. The light source emits light to the image-formed element through the light guiding tube, the lens group, the reflection element and the prism in order. A angle included between an optical axis of the light and a normal of the reflective surface is equal to or larger than 45 degrees.

Description

Projection device

The present invention relates to a projection apparatus, and more particularly to a projection apparatus that is more elastic in spatial matching.

Conventional projection devices include a light source, an imaging element, and a lens that must be placed in a limited space in conjunction with the optical path design. However, most of the current light sources and lenses are located on the same side of the imaging element, which results in a spatially susceptible interference problem between the light source and the lens.

The present invention relates to a projection apparatus which can improve the problem that the light source and the lens are easily interfered spatially.

According to an embodiment of the invention, a projection device is proposed. The projection device comprises a light guide, a reflective element, a lens group, a cymbal, an imaging element and a light source. The reflective element has a reflective surface. The lens assembly is disposed between the light pipe and the reflective element. The light source emits a light sequentially through the light pipe, the lens group, the reflective element and the cymbal to the imaging element, and the angle between the optical axis of the light and the normal of the reflective surface is equal to or greater than 45 degrees.

In order to better understand the above and other aspects of the present invention, The preferred embodiment is described in detail with reference to the accompanying drawings.

100,200‧‧‧projector

110‧‧‧Light source

120‧‧‧Mirror

130‧‧‧Light pipes

130m‧‧‧ Rectangular illuminating surface

140‧‧‧ lens group

141‧‧‧ lens

150‧‧‧reflecting elements

150s‧‧‧reflecting surface

151‧‧‧Ontology

152‧‧‧reflective layer

160‧‧‧ Picture

161‧‧‧ first

162‧‧‧Second

163‧‧‧ lens

170‧‧‧ lens

180‧‧‧ imaging components

180m‧‧‧Rectangle imaging surface

A1‧‧‧ angle

C1‧‧‧ gap

Y1, X2‧‧‧ length

L‧‧‧Light

N1‧‧‧ normal

X1, Y2‧‧‧ width

OP1‧‧‧first optical axis

OP2‧‧‧second optical axis

FIG. 1A is a side view of a projection apparatus in accordance with an embodiment of the present invention.

Fig. 1B is a view showing the light guide and the imaging element in the front view of Fig. 1A.

2 is a side view of a projection apparatus in accordance with another embodiment of the present invention.

Referring to FIG. 1A, a side view of a projection apparatus in accordance with an embodiment of the present invention is shown. The projection device 100 is disposed in one of three-dimensional spaces defined by the X direction, the Y direction, and the Z direction. The projection apparatus 100 includes a plurality of light sources 110, a mirror 120, a light pipe 130, a lens group 140, a single reflective element 150, a cymbal 160, a lens 170, and an imaging element 180.

Light L of at least one of the light sources 110 is reflected to the light pipe 130 via the mirror 120. For example, light L emitted from one of the light sources 110 is reflected to the light pipe 130 via the mirror 120, and light L emitted from the other light source 110 is directly incident on the light pipe 130. In another embodiment, the number of the light sources 110 is not limited to two, and may be three or more. Each light source 110 can be a white light source, a red light source, a green light source, or a blue light source.

The light source 110 emits light L along the first optical axis OP1 in the Z direction, sequentially through the light pipe 130, the lens group 140, the reflective element 150 and the cymbal 160 to the imaging element 180; then, the light L is reflected back by the imaging element 180 The cymbal 160 emits light from the lens 170 to form a projected picture on a screen (not shown). due to The angle A1 between the optical axis OP1 of the light ray L and the normal line N1 of the reflecting surface 150s of the reflective element 150 is equal to or greater than 45 degrees, so that the lens 170 and the light source 110 are located on opposite sides of the imaging element 180. In this way, the spatial matching of the light source 110 and the lens 170 can be improved, and the light source 110 and the lens 170 can be prevented from being easily interfered spatially.

Further, the light L has a first optical axis OP1 between the light source 110 and the reflective surface 150s, and the light L has a second optical axis OP2 between the imaging element 180 and the lens 170. The angle of the reflective element 150 (adjusting the orientation of the normal line N1) can be adjusted such that the angle A1 between the first optical axis OP1 and the normal N1 direction of the reflective element 150 is equal to or greater than 45 degrees; or the light pipe 130 and the lens can be adjusted. The group 140 is positioned such that the angle A1 between the first optical axis OP1 and the normal N1 direction of the reflective element 150 is equal to or greater than 45 degrees.

In the present embodiment, the first optical axis OP1 between the light source 110 and the reflective surface 150s is parallel to the second optical axis OP2 between the imaging element 180 and the lens 170. However, this is not intended to limit the embodiments of the present invention. In another embodiment, the positions of the light pipe 130 and the lens group 140 can be adjusted such that the first optical axis OP1 between the light source 110 and the reflective surface 150s is not parallel to the second optical axis OP2 between the cymbal 160 and the lens 170. .

The lens group 140 includes a plurality of lenses 141, wherein the lens 141 may be a concave lens or a convex lens. Lens group 140 is disposed between light pipe 130 and reflective element 150, which determines the focus or focal length of the light path.

The reflective element 150 includes a body 151 and a reflective layer 152. The body 151 is made of, for example, plastic, metal or glass, and the reflective layer 152 is formed on the body 151, for example, by coating, so that the body 151 and the reflective layer 152 form a reflection. Reflecting element 150 of face 150s.

The cymbal 160 is disposed between the reflective element 150 and the lens 170. The cymbal 160 includes a first 稜鏡161, a second 稜鏡162, and a lens 163, wherein a gap C1 is formed between the opposite sides of the first 稜鏡161 and the second 稜鏡162, so that the first 稜鏡161 is incident. The light ray L can be totally reflected to the imaging element 180 and then reflected back to the first 稜鏡 161 and the second 稜鏡 162 to the lens 170 by the imaging element 180.

The imaging element 180 is parallel to the XY plane, such as a Digital Micromirror Device (DMD), which controls the angle of reflection of the plurality of microlenses by an electronic signal to produce a projected image. The projected image is projected to a screen (not shown) via the cymbal 160 and the lens 170.

In summary, the light source 110, the mirror 120, the light pipe 130, the lens group 140, the single reflective element 150, the cymbal 160, the lens 170 and the imaging element 180 are arranged in a zigzag shape. Such a configuration can shorten the length of the projection device 100.

Please refer to FIG. 1B, which shows a front view of the projection apparatus of FIG. 1A (the lines are not avoided, and only the light guide and the imaging element are shown). The imaging element 180 has a rectangular imaging surface 180m (also labeled in FIG. 1A), and the light pipe 130 has a rectangular light exit surface 130m on the XY plane (not shown in FIG. 1A). The rectangular light-emitting surface 130m has a width X1 in the X direction and a length Y1 in the Y direction, and the length Y1 is greater than the width X1; and the rectangular imaging surface 180m has a length X2 in the X direction and a width Y2 in the Y direction, and the length X2 is greater than the width Y2, wherein The ratio of the length Y1 of the rectangular light-emitting surface 130m to the width X1 is equal to the length of the rectangular imaging surface of 180m. The ratio of X2 to width Y2, that is, Y1/X1=X2/Y2. Further, the rectangular light-emitting surface 130m is different from the set orientation of the rectangular image-forming surface 180m by 90 degrees. Since the rectangular light-emitting surface 130m and the rectangular imaging surface 180m are disposed at an angle of 90 degrees, the relative angle between the light source 110 and the light guide 130 can be eliminated. In particular, for a plurality of light sources 110 (for example, a red light source, a green light source, and a blue light source), since the angle of the light source 110 is not particularly adjusted, the complexity of spatial matching of the plurality of light sources 110 can be reduced.

Please refer to FIG. 2, which illustrates a side view of a projection apparatus in accordance with another embodiment of the present invention. The projection device 200 includes a plurality of light sources 110, a mirror 120, a light pipe 130, a lens group 140, at least two reflective elements 150, a cymbal 160, a lens 170, and an imaging element 180. Different from the projection device 100, the number of the reflective elements 150 of the projection device 200 of the embodiment is plural, and the light source 110, the mirror 120, the light pipe 130, the lens group 140, the two reflective elements 150, and the cymbal can be added. 160. The manner in which the lens 170 and the imaging element 180 are spatially arranged. The reflective element 150 of the present embodiment is illustrated by two examples. However, in another embodiment, the number of reflective elements 150 may exceed two.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧Projection device

110‧‧‧Light source

120‧‧‧Mirror

130‧‧‧Light pipes

130m‧‧‧ Rectangular illuminating surface

140‧‧‧ lens group

141‧‧‧ lens

150‧‧‧reflecting elements

150s‧‧‧reflecting surface

151‧‧‧Ontology

152‧‧‧reflective layer

160‧‧‧ Picture

161‧‧‧ first

162‧‧‧Second

163‧‧‧ lens

170‧‧‧ lens

180‧‧‧ imaging components

180m‧‧‧Rectangle imaging surface

A1‧‧‧ angle

C1‧‧‧ gap

L‧‧‧Light

N1‧‧‧ normal

OP1‧‧‧first optical axis

OP2‧‧‧second optical axis

Claims (9)

A projection device comprising: a light guide; a reflective element having a reflective surface; a lens group disposed between the light guide and the reflective element; a cymbal; an imaging element; a light source emitting a light The angle between the optical axis of the light and the normal of the reflective surface is equal to or greater than 45 degrees via the light guide, the lens group, the reflective element and the cymbal to the imaging element. The projection device of claim 1, further comprising: a lens disposed between the reflective element and the lens; wherein the light is reflected by the imaging element back to the lens and from the lens sold out. The projection device of claim 2, wherein the lens and the light source are located on opposite sides of the imaging element. The projection device of claim 2, wherein the optical axis of the light source to the reflecting surface is parallel to the optical axis of the lens to the optical axis of the lens. The projection device of claim 2, wherein the optical axis of the light source to the reflecting surface is not parallel to the optical axis of the lens to the lens. The projection device of claim 1, wherein the light guide has a rectangular light-emitting surface, the imaging element has a rectangular imaging surface, the rectangular light-emitting surface and the rectangular imaging surface have the same aspect ratio, and the rectangle The illuminating surface is 90 degrees out of alignment with the rectangular imaging surface. The projection device of claim 1, comprising: a plurality of the reflective elements between the lens group and the cymbal. The projection device of claim 1, comprising: a plurality of the light sources; and a mirror for reflecting light of at least one of the light sources to the light pipe. The projection device of claim 1, wherein the imaging element is a Digital Micromirror Device (DMD).