TWI480664B - Optical device - Google Patents

Description

Optical device

The present invention relates to an optical device, and more particularly to an optical device for a projection device having a short focal length.

1 is a perspective view of a conventional short-focus lens 100. The conventional short-focus lens 100 includes a fixed base 10, a front group frame 20, an adapter ring 30, and a rear group frame 40. The front group frame 20 carries the front lens group 22 and is fixed to the fixing base 10 by the adapter ring 30. The rear group frame 40 carries the rear lens group 42 and is bolted to the fixing base 10. 2 is a cross-sectional view of a conventional rear group frame 40. The rear group frame 40 is integrally formed integrally and is locked to the fixed base 10 by bolts passing through the through holes 44. 3A and 3B show a state in which the front group frame 20 is coupled to the adapter ring 30, and the bolt 8 locks the front group frame 20 and the fixed base 10.

In the above configuration, since the rear group frame 40 is fixed to the fixing base 10, the position of the rear lens group 42 is fixed, and the back focus difference cannot be adjusted. In addition, since the front group frame 20 is driven to rotate by a rotating cylinder (not shown) and carries the front lens group 22, and the weight of the front lens group 22 is heavy, it is impossible to ensure the shaking of the front group frame 20 when the adapter ring 30 is rotated. The difference amount, in addition, because the front group frame 20 is made of a plastic material, and the adapter ring 30 is made of a metal material, the thermal expansion coefficients of the two are different, which tends to be unstable when combined, and causes reproducibility of the focusing picture. .

In view of the above, an object of the present invention is to provide an optical device, particularly an infrared short-focus lens, in which the front group frame and the fixing seat are fixed in a screw-lock manner, without To use the adapter ring, the group frame is fixed to the fixed seat after the group frame, and the rear group frame is bolted to the rear group frame to adjust the distance of the back focus.

Another object of the present invention is to integrate a horizontal optical path (or an optical path) and a vertical optical path (or a receiving optical path) into an optical device by the arrangement of a front lens group, a rear lens group, and a side lens group.

In order to achieve the above object, a preferred embodiment of the optical device of the present invention includes a front lens group, a mirror, a rear lens group, and a lens group, wherein a first light of a light source passes through the rear lens group and is worn. The mirror is projected from the front lens group and a second light passes through the front lens group, and is reflected by the mirror and passes through the side lens group.

In a preferred embodiment, the optical path of the first ray and the optical path of the second ray share the front lens group.

In a preferred embodiment, the optical device further includes a fixing base, a front group frame, a rear group frame, a rear group frame and a mirror base. The fixing base has a body, a mating portion, a receiving portion and a lens holder portion, the mating portion extending from the body in a first direction, the receiving portion extending from the body in a direction opposite to the first direction The lens holder portion is coupled to the receiving portion and carries the side lens group. The front group frame carries the front lens group and is coupled to the mating portion. The rear group frame is fixed to the fixing base. The rear group frame carries the rear lens group and is fixed to the rear group frame. The mirror mount is fixed to the receiving portion. The mirror is fixed to the fixing seat, and an optical axis of the front lens group, an optical axis of the first rear lens group, and an optical axis of the rear lens group pass through the mirror.

In a preferred embodiment, the mating portion has a male thread, and the front group frame has a female thread. The male thread is locked to the female thread, and the front group frame is coupled to the mating portion.

In a preferred embodiment, the fixing base has a first positioning post, and the rear group frame The seat has a first positioning hole, and the optical axis of the front lens group coincides with the optical axis of the second rear lens group by the first positioning post being coupled to the first positioning hole.

In a preferred embodiment, a screw hole is formed in the positioning post, and the rear frame frame is fixed to the fixing base by a bolt.

In a preferred embodiment, the positioning post is disposed on an outer peripheral surface of the lens holder portion.

In a preferred embodiment, the rear group frame has a sleeve portion that is bolted to the sleeve portion.

In a preferred embodiment, the fixing base has a second positioning post disposed on the receiving portion, the mirror housing has a second positioning hole, and the second positioning post is coupled to the second positioning hole. The mask holder is positioned at the receiving portion.

In a preferred embodiment, a screw hole is formed in the second positioning post, and the mirror base is locked to the receiving portion by a bolt.

In a preferred embodiment, the mirror has a frame and a mirror portion, and the frame is locked to the mirror frame by a bolt, so that the mirror portion is pressed by the frame to the mirror base.

In a preferred embodiment, the optical device further includes a digital micromirror device (DMD), and the first light from the light source is reflected by the digital micromirror device and passes through the second rear lens group.

In a preferred embodiment, the optical device further includes a charge-coupling device, and the second light system reflected by the mirror and passing through the first rear lens group is imaged by the charge-coupling device.

In a preferred embodiment, the optical device is a lens.

In a preferred embodiment, the second light is an infrared light.

In a preferred embodiment, the first light is projected onto a screen, and the first light and the second light are reflected by the screen. After passing through the front lens group, the first light is filtered by the mirror. The second light is reflected by the mirror and passes through the side lens group.

The above and other objects, features, and advantages of the invention will be apparent from

2, 3, 8, 9‧‧‧ bolts

5‧‧‧Digital micromirror device

7‧‧‧ Charge coupling device

10‧‧‧ Fixed seat

20‧‧‧Pre-group

22‧‧‧ front lens group

30‧‧‧Adapter ring

40‧‧‧After the group

42‧‧‧ Rear lens group

44‧‧‧through hole

100‧‧‧ short-focus lens

200‧‧‧Optical device

210‧‧‧ Fixed seat

211‧‧‧ body

212‧‧‧ Matching Department

213‧‧‧First positioning column

214‧‧‧ male thread

215‧‧‧Second positioning column

216‧‧‧ accommodating department

218‧‧‧Mirror seat

2182‧‧‧through hole

220‧‧‧前群框

221‧‧‧ Carrying Department

222‧‧‧ front lens group

223‧‧‧First connection

224‧‧‧ female thread

225‧‧‧Second connection

226‧‧‧ recess

230‧‧‧ rear group frame

231‧‧‧First positioning hole

232‧‧‧Sleeve Department

238‧‧‧Long groove

240‧‧‧After group

242‧‧‧ Rear lens group

250‧‧‧Mirror seat

252‧‧‧ screw holes

255‧‧‧Second positioning hole

260‧‧‧Mirror

262‧‧‧Mirror Department

264‧‧‧ Frame

266‧‧‧ bolts

L1, L2‧‧‧ optical axis

X‧‧‧ first direction

Fig. 1 is a perspective view of a conventional short-focus lens.

2 is a cross-sectional view of a rear group frame of a conventional short-focus lens.

FIG. 3A is a perspective view of a front group frame and an adapter ring of a conventional short-focus lens.

Figure 3B is a front view of the front group frame and the adapter ring of the conventional short-focus lens.

Figure 4 is a perspective cross-sectional view of the optical device of the present invention.

Figure 5 is a cross-sectional view of the optical device of the present invention.

Fig. 6 is a perspective view of a fixing base of the optical device of the present invention.

Fig. 7 is a perspective view of the fixing base and the rear group frame of the optical device of the present invention.

Figure 8 is a partial cross-sectional view of Figure 7.

Fig. 9 is a perspective view showing a housing portion of a fixing base of the optical device of the present invention.

Fig. 10 is a perspective view showing the face holder of the optical device of the present invention positioned at the accommodating portion.

Figure 11 is a cross-sectional view showing the face holder of the optical device of the present invention positioned at the receiving portion.

Figure 12 is a perspective view of a mirror mount of the optical device of the present invention.

Figure 13 is a combination view of a mirror and a mirror holder of the optical device of the present invention.

Please refer to FIG. 4 and FIG. 5, which illustrate an embodiment of the optical device of the present invention. In this embodiment, the optical device 200 is a short focal length lens, which includes a fixing base 210, a front group frame 220, and a rear portion. The group frame 230, the rear group frame 240, the mirror base 250, and the mirror 260 are described below.

Referring to FIG. 6 , the fixing base 210 includes a plate-shaped body 211 , a cylindrical fitting portion 212 , a receiving portion 216 , and a mirror portion 218 . The mating portion 212 extends from a side of the body 211 toward a first direction x and defines a male thread 214 on the outer peripheral surface thereof (see FIG. 5); the receiving portion 216 has a cylindrical shape from the other side of the body 211 toward the first The direction of the opposite direction of the x is extended, and a receiving space is formed in the receiving portion 216 for receiving the mirror base 250. The receiving space communicates with the cylindrical inner space of the mating portion 212. The mirror portion 218 is square and connected to the receiving portion. 216, a circular through hole 2182 is formed in the mirror base portion 218 to communicate with the above-mentioned accommodation space for placing the side lens group 270.

Returning to FIG. 5, the front group frame 220 has an annular carrying portion 221 for carrying the front lens group 222. The front group frame 220 further has a first connecting portion extending in a direction opposite to the carrying portion 221 but having a different diameter. 223 and the second connecting portion 225, the axial length of the first connecting portion 223 is greater than the axial length of the second connecting portion 225, and a female thread 224 is formed on the inner circumferential surface of the first connecting portion 223, at the first connecting portion A recess 226 is formed between the 223 and the second connecting portion 225. When the front group frame 220 is combined with the fixing base 210, the recess portion 226 receives the mating portion 212 of the fixing base 210, and is locked by the male thread 214 of the fixing base 210. The female thread 224 of the front group frame 220 fixes the front group frame 220 to the fixed seat 210.

Since the front group frame 220 of the present invention is fixed to the fixing base 210 by the male thread 214 and the female thread 224, the lens can be shaken while rotating, and the movement of the lens when focusing is smoothed.

Please refer to FIGS. 6, 7, and 8 to form a shape on the side wall of the mirror portion 218 of the fixing base 210. A first positioning post 213 is formed on the rear group frame 230. The first positioning hole 231 is formed on the rear group frame 230. The first positioning hole 231 is matched with the first positioning post of the fixing base 210 by the first positioning hole 231. The 213 can be positioned on the fixing base 210, and a screw hole is formed in the first positioning 213. The bolt 9 is locked to the screw hole to fix the rear group frame 230 to the fixing base 210.

Since the rear group frame 230 of the present invention is fixed to the fixing base 210 by the first positioning hole 231 of the fixing seat 210, the front group frame 220 and the rear group frame can be effectively controlled. The concentricity of the rear group frame 240 on 230.

Referring to FIGS. 7 and 8, the rear group frame 240 carries the rear lens group 242. The rear group frame 230 has a sleeve portion 232. The cylindrical rear group frame 240 has an outer diameter that matches the inner diameter of the sleeve portion 232. The rear group frame 240 is attached to the sleeve portion 232 of the rear group frame 230, and the rear group frame 240 is fixed to the rear group frame 230 by the bolts 3. In addition, a plurality of long grooves 238 are formed in the sleeve portion 232, and the bolts 3 are locked to the rear group frame 240 through the long grooves 238, so that the position of the rear group frame 240 can be adjusted to achieve the purpose of adjusting the back focal length.

The rear group frame 240 of the present invention assembles and sets the long grooves 238 by fitting the inner and outer diameters of the rear group frame 230, whereby the amount of back focus difference can be effectively adjusted.

The second positioning post 215 is disposed in the receiving portion 216 of the fixing base 210, and a second positioning hole 255 is formed on the mirror base 250. The second positioning post 215 is coupled to the second positioning post 215. Two positioning holes 255, the mirror base 250 can be positioned in the receiving portion 216 of the fixing base 210, a screw hole is formed in the second positioning post 215, and the mirror base 250 is fixed by the bolt 2 (refer to FIG. 11). In the housing 216 of the seat 210.

The mirror base 250 of the present invention can be effectively positioned in the receiving portion 216 of the fixing base 210 by the second position post 215 being coupled to the second positioning hole 255.

Referring to FIGS. 12 and 13, the mirror 260 includes a mirror portion 262 and a frame 264. The mirror base 250 has two screw holes 252. The frame 264 of the mirror 260 is fixed to the mirror base 252 by bolts 266. This mirror portion 262 is pressed by the mirror frame 264 to the mirror mount 250.

Returning to FIG. 5 , the rear group frame 230 is positioned on the fixing base 210 by the first positioning post 213 of the fixing base 210 , and the rear group frame 240 is coaxial with the front group frame 220 . Therefore, the optical axes of the front lens group 222 carried in the front group frame 220 and the rear lens group 242 carried in the rear group frame 240 coincide with each other to become the optical axis L1, and the optical axis L1 passes through the mirror 260, and the optical axis of the side lens group 270 L2 also passes through mirror 260. The first light from the light source is reflected by a digital micromirror device (DMD), and then passed through the rear lens group 242 and the mirror 260 to project a picture to a screen (for example, an electronic whiteboard) via the front lens group 222. (not shown), when the user uses a light pen of a second light (for example, infrared light) to act on the screen (for example, writing on the electronic whiteboard), the first light and the second light are reflected by the screen back to the present invention. After passing through the front lens group 222, the first light is filtered by the mirror 260, and the second light is reflected by the mirror 260 and then imaged by the side lens group 270 to the charge coupling device 7.

As can be seen from the above description, the present invention provides a horizontal optical path (light passes through the rear lens group 242, the mirror 260, and the front lens group 222) and a vertical optical path by the arrangement of the front lens group 222, the rear lens group 242, and the side lens group 270 ( Light is integrated into an optical device through the front lens group 222, the mirror 260, and the side lens group 270), and in the optical device, the optical path of the first light and the optical path of the second light share the front lens group 222.

The present invention has been disclosed in the above embodiments, but it is not intended to limit the scope of the present invention. Any one skilled in the art can make some modifications and retouchings without departing from the spirit of the invention. The scope of protection is defined by the scope of the patent application attached to it. quasi.

200‧‧‧Optical device

210‧‧‧ Fixed seat

214‧‧‧ male thread

216‧‧‧ accommodating department

220‧‧‧前群框

221‧‧‧ Carrying Department

222‧‧‧ front lens group

223‧‧‧First connection

224‧‧‧ female thread

225‧‧‧Second connection

226‧‧‧ recess

230‧‧‧ rear group frame

240‧‧‧After group

242‧‧‧ Rear lens group

250‧‧‧Mirror seat

260‧‧‧Mirror

L1, L2‧‧‧ optical axis

Claims (16)

An optical device comprising: a front lens group; a mirror; a rear lens group; a lens group; a fixed seat; a front group frame carrying the front lens group and coupled to the fixed seat; a frame seat fixed to the fixing seat; a rear group frame carrying the rear lens group and fixed to the rear group frame; and a lens holder fixed to the fixing seat and the mirror fixed to the mirror frame a first light of a light source passes through the rear lens group, passes through the mirror and projects a picture from the front lens group, and a second light passes through the front lens group, is reflected by the mirror and passes through the mirror Side lens group. The optical device of claim 1, wherein the optical path of the first light and the optical path of the second light share the front lens group. The optical device of claim 2, wherein the fixing base has a body, a mating portion, a receiving portion and a lens holder portion, the mating portion extending from the body toward a first direction, the receiving portion a portion extending from the body in a direction opposite to the first direction, the lens holder portion being coupled to the receiving portion and carrying the side lens group, the front group frame being coupled to the mating portion, the mirror frame being fixed to the receiving portion And the optical axis of the front lens group, the optical axis of the first rear lens group, and the optical axis of the rear lens group pass through the mirror. The optical device of claim 3, wherein the mating portion has a male thread, and the front group frame has a female thread, and the male thread is locked to the female thread by the male thread, and the front group frame is combined In the mating part. The optical device of claim 3, wherein the fixing base has a first positioning post, the rear group frame has a first positioning hole, and the first positioning post is coupled to the first positioning a hole that causes an optical axis of the front lens group to coincide with an optical axis of the second rear lens group. The optical device of claim 5, wherein a screw hole is formed in the positioning post, and the rear frame frame is fixed to the fixing base by a bolt. The optical device of claim 5, wherein the positioning post is disposed on an outer peripheral surface of the lens holder portion. The optical device of claim 3, wherein the rear group frame has a sleeve portion, and the rear group frame is bolted to the sleeve portion. The optical device of claim 3, wherein the fixing base has a second positioning post disposed on the receiving portion, the mirror housing has a second positioning hole, and the second positioning post is coupled The second positioning hole is configured to position the mirror base to the receiving portion. The optical device of claim 9, wherein a screw hole is formed in the second positioning post, and the mirror frame is locked to the receiving portion by a bolt. The optical device of claim 3, wherein the mirror has a frame and a mirror portion, the frame being locked to the mirror frame by a bolt, wherein the mirror portion is pressed by the frame Mask seat. The optical device of claim 3, further comprising a digital micromirror device (DMD), the first light from the light source via the digital micro The mirror device passes through the second rear lens group after being reflected. The optical device of claim 3, further comprising a charge-coupling device, the second light system reflected by the mirror and passing through the first rear lens group being imaged by the charge-coupling device. The optical device of claim 1, wherein the optical device is a lens. The optical device of claim 1, wherein the second light is an infrared light. The optical device of claim 1, wherein the first light is projected onto a screen, and the first light and the second light are reflected by the screen, and the first light is passed through the front lens group. Filtered by the mirror, the second light is reflected by the mirror and passes through the side lens group.