CN203799168U - Lens cap assembly and projector comprising same - Google Patents

Abstract

The utility model provides a lens cap assembly and a projector comprising the same. The lens cap assembly comprises a housing and a lens cap, and is characterized by comprising a gear component, a lens cap guide component and an extension spring, wherein the gear component is formed in a fan shape, teeth are formed on the outer end edge of the fan shape, a convex shaft is formed at the circle center of the fan shape, and a guide projection is formed on the surface of the fan shape; and the lens cap guide component is provided with a guide rail which guides the lens cap to slide. The lens cap is provided with a rack, the rack is matched with the teeth of the gear component, the lens cap is provided with a sliding part, the sliding part is matched with the guide rail of the lens cap guide component, the housing is provided with a shaft hole, the convex shaft penetrates the shaft hole, the housing is provided with an arc-shaped long hole, the guide projection of the gear component is matched with the long hole, one end of the extension spring is fixed to the lens cap guide component, and the other end is fixed to the front end of the guide projection. The lens cap guide component can be formed by few components, and can realize miniaturization.

Description

Lens cover assembly and projector with the lens cover assembly

technical field

The utility model relates to a lens cover assembly for a projector and a projector with the lens cover assembly.

Background technique

In a projector, a lens cover is used to protect the lens, as well as to block the projected light from the lens, either by sliding the lens cover to the front of the lens to block the projected light projected forward (closing the lens cover), or by sliding the lens cover away And make the projection light projected (open the lens cover). The lens cover assembly usually works in a semi-automatic manner. For example, Patent Document 1 describes a lens cover assembly in which a torsion spring is used to realize semi-automatic movement of the lens cover. That is, when closing (or opening) the lens cover, the force is applied manually in the first half to make the lens cover move. to the specified position without continuing to apply force manually.

However, in the configuration of Patent Document 1, a large number of parts is required, and since the torsion spring must be located between the lens cap and the base having the lens opening, it is difficult to put in and install it with a hand, and the assemblability is poor. .

In addition, during the operation of the lens cover, there are many friction parts (between the torsion spring and the lens cover, between the torsion spring and the case, between the lens cover and the guide rail, etc.), so it is easy to generate friction powder, which may adhere to the On the lens, lighting, etc., the projection performance will be deteriorated.

In addition, when opening or closing the lens cover, the moving amount of the operating point is equal to the moving amount of the lens cover, so the length of the lens cover and the case cannot be shortened, and it is difficult to miniaturize the lens cover assembly.

prior art literature

Patent Document 1 Japanese Patent Publication No. 2008-268716A

Utility model content

In order to solve the above technical problems, the first aspect of the utility model provides a lens cover assembly, including a cover with an opening for the light beam from the lens to pass through and a lens that can slide relative to the cover to block or open the opening The cover is characterized in that it also includes: a gear part, which is formed in a fan shape, teeth are formed on the outer edge of the fan shape, and a convex shaft is formed at the center of the fan shape, and a guide protrusion is formed on the fan shape surface; the lens cover A guide piece is fixed on the casing, and is provided with a guide rail for guiding the lens cover to slide; and a tension spring, the lens cover has a rack, and the rack is matched with the teeth of the gear member, and the The lens cover has a sliding part, and the sliding part is matched with the guide rail of the lens cover guide, and the casing is provided with a shaft hole, and the protruding shaft of the gear member passes through the shaft hole, and the casing There is an arc-shaped long hole on the top, and the guide protrusion of the gear part is matched with the long hole. One end of the tension spring is fixed to the lens cover guide, and the other end is fixed to the guide protrusion. Front end.

The second aspect of the present utility model is based on the above-mentioned first aspect, wherein the rack is arranged on the upper end of the main body of the lens cover, and there is a gap between the rack and the main body .

The third aspect of the present utility model is based on the above-mentioned second aspect, wherein the gear member further has a fan-shaped plate portion, the teeth are formed on the fan-shaped plate portion, and the teeth and the lens A part of the fan-shaped plate portion enters the gap in a state where the racks of the cover are engaged.

A fourth aspect of the present utility model is based on the above-mentioned first to third aspects, and is characterized in that a stop lever is provided at the front end of the protruding shaft.

The fifth aspect of the present utility model is based on the above fourth aspect, characterized in that a cutout is provided on the upper end of the lens cover guide, the cutout cooperates with the protruding shaft passing through the shaft hole, and the The stop bar is hooked to the edge of the cutout.

The sixth aspect of the present utility model is based on the above first to third aspects, characterized in that a notch is formed on the edge of the shaft hole, and the lens cover guide is also formed on the edge of the notch. There are protrusions which fit into the notches.

According to the present invention, it is possible to form a configuration of a lens cap assembly for blocking/opening a lens opening of a projector with a small number of parts.

Moreover, since the tension spring can be installed on the periphery of the lens cover assembly, the assembly performance is excellent.

Moreover, in the present invention, tension springs are used instead of torsion springs to provide elastic force, so friction dust does not occur due to multiple friction parts as in Patent Document 1, and the projection performance of the projector can be prevented from deteriorating.

Furthermore, according to the structure of the present utility model, when opening or closing the lens cover, the linear motion of the lens cover is transformed into a circular motion through the engagement of the gear member and the rack of the lens cover, so the movement of the operating point (protruding shaft) is less than The amount of movement of the lens cover. Since the utility model can realize a large amount of movement of the lens cover with a small amount of movement of the action point, compared with the structure of the prior art, the length of the lens cover and the casing can be reduced, thereby reducing the overall size of the lens cover assembly. length.

Description of drawings

FIG. 1 is an overall perspective view of the projector.

Fig. 2 is an overall perspective view of the lens cover assembly.

Figure 3 is an exploded assembly view of the lens cover assembly viewed from the lens cover side (outside of the projector).

FIG. 4 is an exploded assembly view of the lens cover assembly viewed from the side of the lens cover guide 14 (inner side of the projector).

5 is a side cross-sectional view of the lens cover assembly.

Fig. 6 is an assembly view of the lens cover assembly viewed from the inside.

FIG. 7 is a diagram showing a fall-off prevention structure of the lens cover guide.

Fig. 8 is a diagram showing a fall-off preventing structure of a gear member.

Figure 9(a) to Figure 9(c) are diagrams showing the working process of the lens cover, wherein, Figure 9(a) is a diagram showing an open state, Figure 9(b) is a diagram showing a half-open state, and Figure 9 (c) Diagram showing the closed state.

Detailed ways

The specific embodiment of the present utility model is described below in conjunction with accompanying drawing.

FIG. 1 is an overall perspective view of a projector, wherein reference numeral 100 denotes a projection lens, and reference numeral 12 denotes a lens cover 12 for covering or opening the projection lens 100 .

FIG. 2 is an overall perspective view of the lens cap assembly 1 . Among them, the opening 11 is used for projecting light from a projection lens 100 (not shown), and the lens cover 12 can be slid to open or close the opening 11 .

3 and 4 are respectively an exploded assembly view of the lens cover assembly 1 viewed from the outside of the projector, and an exploded assembly view of the lens cover assembly 1 viewed from the inside of the projector. From the outside to the inside of the projector, there are lens cover 12, gear member 16, casing 13, lens cover guide 14 and spring 15 in sequence. It can be seen that spring 15 is arranged on the periphery of lens cover assembly 1 (the innermost side) ), so it is easy to assemble.

As shown in FIGS. 3 to 5 , the lens cover 12 has a main body 121 and a rack 122 , and a gap (not shown) exists between the racks 121 and 122 . The gear member 16 has a sector-shaped plate portion 164 and teeth 163 protruding from the sector-shaped plate portion 162 . In the assembled state shown in FIG. 6 , the teeth 163 mesh with the rack 122 so that the linear motion of the lens cover 12 can be converted into circular motion (rotation) of the gear member 16 . In a state where the teeth 163 and the rack 122 are engaged, a part of the fan-shaped plate portion 164 enters the gap between the main body portion 121 and the rack 122 .

A protruding shaft 162 is provided at the approximate center of the sector of the gear member 16 , and a shaft hole 132 matching the cam shaft is provided on the lens plate surface 13 having the opening 11 . In addition, a semicircular notch 141 is formed at the upper end of the lens cover guide 14 , and a protruding shaft 162 is placed (fitted) on the notch 141 through the shaft hole 132 , and the protruding shaft can freely rotate.

A guide protrusion 161 is also provided on the gear member 16, and the guide protrusion 161 is matched with the arc-shaped elongated hole 131 provided on the lens plate surface 13 (passing through the elongated hole 131), and the guide protrusion 161 can cooperate with the protruding The rotation of the shaft 162 in the shaft hole 132 moves along the long hole 131 synchronously.

The lens cover guide 14 is fixed to the case 13 . A guide rail 142 is provided at the lower end of the lens cover guide 14 for the lens cover 12 to slide thereon to open or close the opening 11 .

As shown in FIG. 6 , in the assembled state, one end of the tension spring 15 is fixed to the lens cover guide 14 , and the other end is fixed to the front end of the guide protrusion 161 of the gear member 16 . When the lens cover 12 is fully opened or fully closed, the extension spring 15 is in an untensioned state.

The falling-off preventing structure of the lens cover guide 14 will be described with reference to FIG. 7 . As shown in FIG. 7 , a protrusion 143 is provided near the cutout 141 of the lens cover guide 14 . A notch 133 is formed on the edge of the shaft hole 132 of the case 13, and by fitting the protrusion 143 with the notch 133, the lens cap guide 14 can be firmly fixed to the case 13, preventing the lens cap guide 14 from Come off from the case 13.

The falling-off preventing structure of the gear member 16 will be described below with reference to FIG. 8 . As shown in FIG. 8 , a stop rod 164 is provided at the front end of the protruding shaft 162 of the gear member 16 , and when the protruding shaft 162 passes through the shaft hole 132 of the casing 13 and is placed in the notch 141 of the lens cover guide 14 , the stop rod 164 is locked on the edge of the cutout 141 , so that the protruding shaft 162 basically does not move in the axial direction, that is, prevents the gear member 16 from falling off from the casing 13 .

In the present invention, as mentioned above, the components of the lens cover assembly 1 are fitted together without using fixing screws, so the assembly is simple.

Figure 9(a) to Figure 9(c) are diagrams showing the working process of the lens cover, wherein, Figure 9(a) is a diagram showing an open state, Figure 9(b) is a diagram showing a half-open state, and Figure 9 (c) Diagram showing the closed state.

As shown in FIG. 9( a ), in the open state, the guide protrusion 161 of the gear member 16 is located at the leftmost end of the long hole 131 , and the extension spring 15 is in an unstretched state without accumulating elastic force. From this state, when the lens cover 12 is manually driven to slide to the right in the figure, the gear member 16 is driven to rotate around the protruding shaft 162 through the engagement of the rack 122 of the lens cover 12 with the teeth 161 of the gear member 16, and the The tension spring 15 is stretched to accumulate elastic force. Figure 9(b) shows that when the guide protrusion 161 is located at the central position of the long hole 131, the tension spring 15 is stretched to the greatest extent and accumulates elastic force to the greatest extent, starting from the state of Figure 9(b), the tension spring 15 The accumulated elastic force starts to be released, and the gear member 16 is driven by the elastic force to continue to rotate. Through the engagement of the rack 122 and the teeth 161 of the gear member 16, the lens cover 12 is driven to continue sliding to the right until the guide protrusion 161 reaches the long The rightmost end of the hole 131 is in the state (closed state) shown in FIG. 9( c ). At this time, the tension spring 15 is in an untensioned state again, and the lens cover 12 closes the opening 11 .

The process of transferring the lens cover 12 from the open state to the closed state has been described above. Obviously, the process of transitioning from the closed state to the open state is just the opposite process, that is, from the state of Figure 9(c) to the state of Figure 9(b), and then to the state of Figure 9(a).

Industrial Applicability

The lens cover assembly of the present invention can be applied to projectors, but it can also be applied to any optical device with a lens.

Claims (7)

1. A lens cover assembly, comprising a housing with an opening for the light beam from the lens to pass through and a lens cover that can slide relative to the housing to block or open the opening, characterized in that, Also includes: The gear part is formed into a fan shape, teeth are formed on the outer edge of the fan shape, and a protruding shaft is formed at the center of the fan shape, and a guide protrusion is formed on the fan shape surface; a lens cover guide, fixed to the casing, and provided with a guide rail for guiding the lens cover to slide; and tension spring, The lens cover has a rack that cooperates with the teeth of the gear member, and the lens cover has a sliding portion that cooperates with the guide rail of the lens cover guide, The casing is provided with a shaft hole through which the protruding shaft of the gear part passes, and the casing is provided with an arc-shaped long hole, and the guide protrusion of the gear part is connected to the long hole. holes to match, One end of the tension spring is fixed to the lens cover guide, and the other end is fixed to the front end of the guide protrusion. 2. The lens cover assembly according to claim 1, wherein: The rack is disposed on the upper end of the main body of the lens cover with a gap between the rack and the main body. 3. The lens cover assembly according to claim 2, wherein: The gear member also has a fan-shaped plate portion on which the teeth are formed, and a part of the fan-shaped plate portion enters the tooth rack in the state where the teeth are engaged with the rack of the lens cover. said gap. 4. The lens cap assembly according to claims 1-3, characterized in that, A stop rod is arranged at the front end of the protruding shaft. 5. The lens cover assembly according to claim 4, wherein: A slit is provided at the upper end of the lens cover guide, the slit cooperates with the protruding shaft passing through the shaft hole, and the stop rod is hooked on the edge of the slit. 6. The lens cap assembly according to claims 1-3, characterized in that, A notch is also formed on the edge of the shaft hole, and a protrusion is formed on the edge of the notch on the lens cover guide, and the protrusion is matched with the notch. 7. A projector, comprising the lens cover assembly according to any one of claims 1-6.