TWI696877B - Improved structure without shadow mask - Google Patents

Abstract

An improved structure of shadowless mask is adopted: the movable tube and the fixed tube of the front and rear umbrella frame clamping units are allowed to be individually nested along the preset range, and the movable tube integrated into the fixed tube The preset paragraph is to maintain a permeable area to cooperate with a drive unit, where the drive unit protrudes toward the permeable area. The row of teeth formed on the corresponding side of the fixed tube inside is in contact with each other as the aforementioned When the driving unit is toggled, it can drive the moving tube to move along the fixed tube in contact with the preset orientation, that is, it can drive the front umbrella clamping unit limited to one end of the moving tube to move toward the preset orientation, so as to cover The front and rear umbrella-clamping units provided with the hood cloth have an exact opening or closing, and can maintain accurate temporary positioning to the required state, and the screw joint for the intermediate tube sleeved inside the aforementioned fixed tube is combined at the rear end. It can be combined with the positioning of lighting equipment (such as lamps, led lamps, halogen lamps...), and the relevant power cords can be included in the intermediate tube to obtain an overall aesthetic.

Description

Improved structure without shadow mask

The invention relates to an improved structure of a shadowless cover, which is mainly used for opening/closing a shadowless cover sleeved on the front end of a flash lamp by using a mobile tube combined with the outer side of a fixed tube with a preset shape and length The required forward and backward displacement can drive the entire umbrella bone to have a precise action, temporary positioning, and the screw joint that is combined with the rear end of the intermediate tube sleeved inside the fixed tube is compatible with lighting equipment (such as: Lamps, led lamps, halogen lamps...) combined positioning, and the relevant power cord is included in the middle tube to obtain an overall aesthetic.

Press, the current camera will obtain a better soft and natural tone when taking the theme person/or object when taking a picture, all will be combined with a shadowless mask at the front of the flash that is erected between the cameras, so that the camera is not As a fill light effect when shooting people indoors or outdoors, it can naturally soften the light from the flash through the shadowless mask. For professional photographers, this kind of shadowless mask with a light-reflecting layer is used to cover the front of the flash to obtain the desired effect of softening the light source and reducing shadow contrast.

The above-mentioned shadowless mask is quite diversified in the form of the group. Here is a new case of the application filed by the inventor of this case and disclosed in the certificate number 106.06.01: M542789 "The composition of the shadowless mask". The cover is included in: the shadowless cover during which one end of the supporting unit that allows the cover portion to be combined is restricted in orientation, and can be combined along the one end to the predetermined connection of the basic body The middle rod section of the area is movable, so that the toggle member moves to the concave area of the preset range of the middle rod section, which forms a restricted state, and drives the aforementioned support unit and the cover part between them to maintain a temporary orientation Restriction; and pressing down the aforesaid pressing member which is displaced to the toggle part of the recessed area of the middle rod section with a resilient outwardly protruding member to make the exit restricted recessed area form a free state and move to the middle rod section The preset range can be used to facilitate the inner folding of the shadowless mask.

The present inventor is here to make another new form design for the action mode of opening and/or collapsing the shadowless cover assembly of the same type set on the front end of the flash, in order to make this shadowless cover in Opening or closing is to use the moving tube combined with the outer side of the fixed tube of the preset shape and length to perform the necessary front-to-back displacement, which can drive the entire umbrella bone to have an exact action and temporary positioning.

The present invention is based on the fact that the shadowless hood is combined with the front end of the flashlight used as fill light to open and/or fold. It can be obtained by another new form of operation to obtain exact temporary positioning. It is adopted: allowing along the preset range The movable tube and the fixed tube of the front and rear umbrella frame clamping units are individually nested with each other, and the preset section of the movable tube incorporated into the fixed tube is to maintain a transparent area to cooperate with the setting of a drive unit The side of the drive unit protruding toward the hollow area is in contact with the row of teeth formed on the corresponding side of the internal fixed tube, as the aforementioned drive unit can drive the moving tube to be fixed along the internal contact when it is toggled When the tube is moved in the preset orientation, the front rib clamping unit, which is limited to one end of the moving tube, can be driven to move toward the preset azimuth, so that the front and rear rib clamping units covered with the action cover can have an exact opening or Closed, and to the required state can maintain accurate temporary positioning.

The main object of the present invention is to use The opening and closing of the combined shadowless cover can be obtained by a simple operation to obtain the exact temporary positioning. The aforementioned shadowless frame includes a middle tube, a fixed tube, a moving tube, a The driving unit, a front and rear umbrella frame clamping unit, and a plurality of umbrella frames; wherein, the side of the fixed tube that is allowed to be introduced into the intermediate tube forms a row of tooth segments to cooperate with the moving tube along the fixed The tube makes the sleeve into a movable shape, and the preset section of the moving tube incorporated into the fixed tube is to maintain an open area to cooperate with a drive unit, where the drive unit protrudes toward the open area is the inner sleeve The row of teeth formed on the corresponding side of the fixed tube is in contact; as the aforementioned drive unit, when it is toggled, it can drive the moving tube to move along the fixed tube in contact with the preset orientation, which can drive it to be restricted in movement. The front umbrella frame clamping unit at one end of the tube moves toward the preset orientation, so that the front and rear umbrella frame clamping units covering the action cover can be accurately opened or closed, and the exact temporary position can be maintained to the required state.

The second object of the present invention is that the drive unit of the shadowless mask frame, which is combined with the transparent area on the side of the moving tube, includes: a gear, two housings, and a hand rocker; Form a containing area to allow gears of the same shape and depth and bearings on both sides to be inserted between them, and introduce the two shells, the internally accommodated gears, and the two side bearings by a section of the rod extending from one side of the aforementioned hand lever Holes, and the lower convex portions of the two shells are correspondingly abutted on the front and back passages of the penetrating area of the moving tube, and the azimuth restriction is carried out by the screw fixing element, so that the aforementioned gear can protrude into the penetrating area into a pre Set the depth to maintain contact with the row of teeth on the side of the fixed tube corresponding to the inside. When the gear is rotated by the hand rocker, it can drive the entire moving tube to move forward and backward along the fixed tube.

The third object of the present invention is to position a partition on the front and rear sides of the moving tube in which the shadowless mask frame is integrated into the fixed tube by screwing elements, and the partition on the back side is It keeps in conflict with a front rib clamping unit and uses screw fixing elements to limit the orientation, so that the displacement of the mobile tube in the front and rear can drive the front rib clamping unit to move together as expected.

The fourth object of the present invention is to keep the rear side of the fixed tube into which the intermediate tube is introduced between the frame of the shadowless mask and a rear umbrella frame clamping unit and to restrict the orientation by means of screw fixing elements, so as to facilitate the aforementioned moving tube 1 The laterally constrained front rib clamping unit can be moved back and forth, and can form a desired opening/closing with the rear rib clamping unit here.

The fifth object of the present invention is to include a partition for the shadow mask frame which is limited to the rear side of the moving tube, and the front and rear umbrella frame clamping units on the rear side of the fixed tube, including two corresponding forms The clamping block is composed of a plurality of coupling pieces that only allow one end of the umbrella bone to be introduced; wherein, the corresponding periphery of the two clamping blocks is a resisting section that maintains a plurality of intervals, and the inner position of the adjacent two resisting sections is concave. Area to allow the extension protrusion of one end of the connecting piece to be introduced and covered by the orientation, and then the corresponding two clamping blocks are integrated into an integrated position by the screwing element, so that each of the peripheral connecting pieces can be received with the umbrella bone Resist moderately.

The sixth object of the present invention is that the preset section on one side of the moving tube position in which the fixed tube is incorporated into the fixed frame of the shadowless mask is to abut a receiving tube section, and the azimuth restriction is carried out by the screw fixing element. It is allowed to put a set of spring-loaded rod parts, and the convex part of the inward end of the rod part is pressed into the concave part of the fixed tube inside the corresponding section of the fixed tube, as the aforementioned moving tube can be borrowed when it needs to be displaced Pull down the lever part to make the convex part at the inward end exit the corresponding concave part of the fixed tube, and the mobile tube can be toggled together in the free state of the drive unit set in the preset paragraph to make the mobile tube fit along the inside The fixed tube is moved in a preset orientation, and when the preset range is reached and the lever is loosened, one end of the moving tube can be pushed into the corresponding concave part of the fixed tube again to obtain an accurate temporary positioning.

The seventh object of the present invention is to fix the fixed tube position of the shadowless mask frame integrated into the intermediate tube at the front end against a receiving member, and to restrict the orientation by means of screw fixing elements, and a concave portion on one side of the receiving member It is to maintain a hole to allow the movement of a knob to be introduced and/or withdrawn, and the rod section of the knob at the end of the recess of the receiving member can be fitted with a positioning member so as to be limited to the inner periphery of the aforementioned hole, and is fitted with a cover sleeve At the outer periphery of the aforementioned positioning member, the middle tube adjacent to the inside when the knob is introduced to the limit can be pressed against/or withdrawn to the limit and then pressed against the recess of the receiving part. The required displacement is to withdraw the knob to drive the covering member at the other end to maintain a distance from the intermediate tube, and to make appropriate adjustment of advance and retreat of the intermediate tube, and to restrict the introduction of the knob to an exact orientation.

The eighth object of the present invention is to individually couple a screw joint to the front and rear ends of the middle tube between which the shadowless mask frame is sleeved inside the fixed tube, so that the screw joint at the rear end can cooperate with the positioning of the lamp.

〔this invention〕

1‧‧‧ intermediate tube

11, 12‧‧‧ Screw joint

2‧‧‧Fixed tube

21‧‧‧Row tooth segment

22, 231‧‧‧recess

23‧‧‧ Accepting parts

232‧‧‧hole

24, 34, 351, 44

25‧‧‧ knob

251,431‧‧‧segment

26‧‧‧Locating parts

27‧‧‧ Cover

3‧‧‧Mobile tube

31‧‧‧Transparent area

32, 33‧‧‧ partition

35‧‧‧ Undertake pipe section

36‧‧‧Tie rod parts

361, 422‧‧‧Convex

37‧‧‧Spring

4‧‧‧Drive unit

41‧‧‧Gear

411‧‧‧bearing

42‧‧‧Housing

421‧‧‧accommodation area

43‧‧‧Hand stick

5,6‧‧‧Umbrella clamping unit

51, 61‧‧‧ clamping block

511, 611‧‧‧ boycott section

512, 612‧‧‧ region

52、62‧‧‧Connecting piece

7‧‧‧ Umbrella

8‧‧‧Frame without shadow cover

Figure 1 is an external view of the assembly of the shadowless mask skeleton of the present invention.

It is an exploded view of relevant components of the shadowless mask skeleton of the present invention.

Figure 1 is the detailed exploded view of the components of the middle tube and the fixed tube of Figure 2.

Figure 2 of Figure 2 is an exploded detail view of the components of the moving tube and drive unit of Figure 2.

Figure 3 of Figure 2 is an exploded detail view of the components of the front and rear umbrella gripping units of Figure 2.

Figure 3 is a schematic cross-sectional view of the assembly of the shadowless mask skeleton of the present invention.

Figure 4 is an enlarged detail view of part A of Figure 3.

Fig. 5 is a schematic diagram of the pull rod member of Fig. 4 pulling downward to make the moving tube free.

Fig. 6 is a schematic diagram of the movable displacement of Fig. 5 as the movable displacement.

FIG. 7 is an enlarged detailed view of part B of FIG. 3.

Fig. 8 is a cross-sectional view of the knob of Fig. 7 rotating outward to exit a pitch.

Fig. 9 is a schematic diagram of the displacement of the middle pipe of Fig. 8 as a movable displacement.

FIG. 10 is a schematic cross-sectional view of the shadowless mask frame of the present invention in a closed state.

The improved structure of the shadowless hood designed by the present invention [as shown in FIG. 2] is that the shadowless hood combined with the front end of the flash lamp used as a fill light can be opened/or collapsed by a simple operation to obtain the exact temporary The positioning is adopted: the aforementioned shadowless mask frame 8 includes an intermediate tube 1, a fixed tube 2, a moving tube 3, a driving unit 4, a front and rear umbrella frame clamping unit 5, 6, and a plurality of Umbrella ribs 7; wherein, the side of the fixed tube 2 that is allowed to be introduced into the intermediate tube 1 forms a tooth row 21 [as shown in FIG. 2] to match the moving tube 3 along the fixed tube 2 The sleeve is combined into a movable state [as shown in Fig. 1], and the preset section of the movable tube 3 incorporated into the fixed tube 2 is to maintain a transparent area 31 [as shown in Fig. 2 of Figure 2] to cooperate with a drive unit 4. The drive unit 4 protrudes toward the penetrating area 31 on the side where the tooth row 21 formed on the corresponding side of the fixed tube 2 inside is in contact [as shown in FIG. 3]; When toggled, it can drive the moving tube 3 to move along the fixed tube 2 in contact with the preset orientation, which can drive the front umbrella clamping unit 5 limited to one end of the moving tube 3 to move toward the preset orientation [as the 10th Figure], so that the front and rear umbrella clamping units 5, 6 covered with the action cover (the action cover is not shown here) have an exact opening or closing, and can maintain the exact temporary position to the required state [such as Figures 3 and 10].

The shadowless mask frame 8 mentioned in the previous paragraph [0015] is integrated between the moving tube 3 The drive unit 4 on the side of the transparent area 31 includes [as shown in Fig. 2 of Figure 2]: a gear 41, two housings 42, and a hand lever 43; wherein, the corresponding interiors of the aforementioned two housings 42 form an accommodating area 421. A gear 41 with a conforming shape and depth and a bearing 411 on both sides are allowed to be interposed therebetween, and the second housing 42 and the gear 41 accommodated inside are introduced into the two casings 42 by a segment 431 extending on the side of the hand lever 43 , And the corresponding holes of the bearing 411 on both sides (here, the two housings can be restricted by screwing elements 44 to each other), and make the aforementioned two housings 42 lean against the lower convex portion 422 corresponding to the transparent area of the moving tube 3 31 before and after the paragraph, and by the screw fixing element 44 for azimuth restriction, the aforementioned gear 41 can protrude into the penetrating area 31 into a predetermined depth to maintain the corresponding row of teeth 21 on the side of the fixed tube 2 inside The contact shape can drive the entire moving tube 3 to move forward and backward along the fixed tube 2 when the gear 41 is rotated by the hand lever 43.

The shadowless mask frame 8 mentioned in the previous paragraph [0015], the front and back sides of the moving tube 3 into which the fixed tube 2 is incorporated are individually positioned a partition 32, 33 by the screw element 34 [as shown in Figure 2, No. 2 and No. 1 Figure], and the partition 33 on the rear side is kept in conflict with a front umbrella clamping unit 5 and is restricted in position by the screw element 34 (as shown in Figure 3, Figure 3) to facilitate The displacement of the moving tube 3 in the front-back direction can drive the front umbrella-clamping unit 5 to move together as expected [as shown in Figures 3 and 10].

The shadowless mask frame 8 mentioned in the previous paragraph [0015] introduces the fixed tube 2 of the intermediate tube 1 between the back side is to maintain a collision with a rear umbrella clamping unit 6 and use the screw fixing element 34 for orientation limitation Figure 3, Figure 1 of Figure 2], to facilitate the front and rear rib clamping unit 5 on the side of the moving tube 3 to move forward and backward, and to form a desired opening/closing with the rear rib clamping unit 6 here [As shown in Figures 3 and 10].

The shadowless mask frame 8 mentioned in the previous paragraph [0015] is individually limited to the partition 33 on the rear side of the moving tube 3, and the front and rear umbrella frame clamping units 5, 6 on the rear side of the fixed tube 2 It is composed of two corresponding shapes of clamping blocks 51, 61, and a plurality of connecting pieces 52, 62 that only allow one end of the rib 7 to be introduced (as shown in Fig. 2 and Fig. 2 of Fig. 2); wherein, the aforementioned two clamping blocks 51 , 61 The corresponding periphery is the resisting sections 511, 611 that maintain a plurality of intervals, and the adjacent two resisting sections 511, 611 are recessed into an area 512, 612 toward the inner position to allow one end of the aforementioned engaging members 52, 62 to extend The convex portions 521, 621 are introduced and covered by the orientation, and then the corresponding two clamping blocks 51, 61 are integrated into an orientation by screwing the element 34 (as shown in FIG. 1), so that each of the leading peripheral connecting pieces 52, 62 It can resist the umbrella bone 7 with a moderate orientation.

The shadowless mask frame 8 mentioned in the previous paragraph [0015] The moving tube 3 in which the fixed tube 2 is integrated between the one side The preset paragraph is against a receiving tube segment 35 (here the receiving tube segment is located next to Side), and by means of the screw fixing element 351 for orientation limitation (as shown in Fig. 4), inside the receiving pipe section 35 is a pull rod member 36 that allows a set of springs 37 to be placed, and makes the pull rod member 36 project toward the inward end The portion 361 abuts the recess 22 in the corresponding section of the fixed tube 2 inside the moving tube 3, as the aforementioned moving tube 3 can pull down the lever member 36 by hand when the displacement needs to be carried out [actuated in the direction of the arrow in FIG. 5], The convex portion 361 at the inward end exits the corresponding concave portion 22 of the fixed tube 2, and the moving tube 3 can be toggled together in the free state of the driving unit 4 set in the preset paragraph, so that the moving tube 3 is nested along the inside The fixed tube 2 is moved in a preset orientation [as shown in Figures 3, 6, and 10], and when the preset range is reached and the lever 36 is loosened by hand, the convex portion 361 of one end of the moving tube 3 can be pushed into the fixed position again. The corresponding recess 22 of the tube 2 has an exact temporary positioning.

The shadowless mask frame 8 mentioned in the preceding paragraph [0015] during which the fixed tube 2 integrated into the intermediate tube 1 is located at the front end is against a receiving piece 23 [as shown in FIG. 2 and FIG. 1 of FIG. 2], and borrowed The screw element 24 is restricted in orientation [as shown in FIG. 1], and a recess 231 on one side of the receiving member 23 holds a hole 232 to allow the movement of a knob 25 to be introduced/withdrawn [as shown in FIGS. 7 and 8], And one end of the knob section 251 of the knob 25 introduced into the recess 231 of the receiving member 23 can be fitted with a positioning member 26 so as to be limited to the inner periphery of the aforementioned hole 232, and a covering member 27 is sleeved on the outer periphery of the aforementioned positioning member 26, The sharp knob 25 can be pressed against the intermediate tube 1 adjacent to the inside when it is introduced to the limit (as shown in FIG. 7)/or with the recess 231 (as shown in FIG. 8) of the receiving member 23 when it is withdrawn as the end The intermediate tube 1 combined with the lamp (the lamp is not shown here) needs to be displaced as necessary, and the knob 25 is withdrawn to drive the covering member 27 at the other end to maintain a distance from the intermediate tube 1, and the intermediate tube 1 Make appropriate advance and retreat adjustments (as shown in Figure 9), and make an exact orientation restriction on the introduction of knob 25 (as shown in Figure 7).

The shadowless mask frame 8 mentioned in the previous paragraph [0015], with the middle tube 1 sleeved inside the fixed tube 2 in between, the front and rear ends are individually combined with a screw joint 11, 12 [as shown in Fig. 2 1] to facilitate The screw joint 12 at the rear end can cooperate with the positioning of the lamp (the lamp not shown here).

The front and rear parts of the preset height inside the moving tube 3 in which the shadowless mask frame 8 mentioned in the paragraph [0015] is incorporated into the fixed tube 2 are individually combined with a pulley (the pulley here is not drawn), as the edge The azimuth movement of the internal fixed tube 2 can keep moving forward and backward smoothly.

1‧‧‧ intermediate tube

2‧‧‧Fixed tube

21‧‧‧Row tooth segment

23‧‧‧ Accepting parts

25‧‧‧ knob

3‧‧‧Mobile tube

32, 33‧‧‧ partition

4‧‧‧Drive unit

42‧‧‧Housing

43‧‧‧Hand stick

5,6‧‧‧Umbrella clamping unit

51, 61‧‧‧ clamping block

52、62‧‧‧Connecting piece

7‧‧‧ Umbrella

8‧‧‧Frame without shadow cover

Claims (6)

An improved structure of shadowless cover is to use the simple and easy operation to obtain the exact temporary positioning of the shadowless cover used in the front of the flash light used for fill light. It is adopted: The shadow mask skeleton is composed of an intermediate tube, a fixed tube, a moving tube, a driving unit, a front and rear umbrella frame clamping unit, and a plurality of umbrella frames; in the foregoing, the fixed tube is allowed to be introduced into the intermediate tube The side layer is formed with a row of teeth, to cooperate with the aforementioned moving tube to form a movable shape along the fixed tube, and the preset section of the moving tube incorporated into the fixed tube is to maintain an open area to cooperate with the setting of a drive Unit, where the drive unit protrudes toward the penetrating area is a tooth row formed on the corresponding side of the fixed tube sleeved inside is in contact; the drive unit is composed of: a gear, two housings, and a hand rocker ; Among them, the corresponding inside of the two shells is formed into a containing area to allow gears of the same shape and depth and the bearings on both sides to intervene between them, and the two hand shells are introduced into the two shells, the inner The gears accommodated, and the corresponding holes on both sides of the bearing, and the lower convex portions of the two shells are correspondingly pressed against the front and back passages of the penetrating area of the moving tube, and the azimuth restriction is carried out by the screw fixing element, so that the gear Protruding into the penetrating area into a preset depth to maintain contact with the corresponding row of teeth on the side of the fixed tube, when the gear is rotated by the hand rocker, it can drive the entire moving tube along the fixed tube to anticipate The forward and backward displacement of the other side; another preset section along the side of the moving pipe is to bear against a receiving pipe section, and the position limitation is carried out by the screw fixing element. Inside the receiving pipe section is allowed to place a set of spring-loaded rod parts, And make the convex part of the inward end of the rod part abut the corresponding section of the fixed tube inside the moving tube As the aforementioned moving tube needs to be displaced, it can pull down the lever member by hand, so that the convex part at the inward end exits the corresponding concave part of the fixed tube, and the moving tube can be toggled together in a free state. The driving unit set in the preset paragraph makes the mobile tube move along the fixed tube nested in the preset direction, and when the preset range is reached and the lever is released, the end of the mobile tube can be raised again. The part abuts the corresponding recess of the fixed tube to obtain an exact temporary positioning; as the aforementioned driving unit can drive the moving tube to move along the fixed tube in contact with the preset orientation when it is toggled, it can be driven to be restricted in movement The front umbrella frame clamping unit at one end of the tube moves toward the preset orientation, so that the front and rear umbrella frame clamping units covering the action cover can be accurately opened or closed, and the exact temporary position can be maintained to the required state. According to the improved structure of the shadowless cover according to item 1 of the patent application scope, the front and rear sides of the moving tube in which the shadowless cover frame is incorporated into the fixed tube are individually positioned by a screwing element to separate a partition, and the area on the back side The spacer is kept in conflict with a front umbrella frame clamping unit and is restricted in orientation by screwing elements, so that the displacement of the moving tube in the front and rear can drive the front umbrella frame clamping unit to move together as expected. According to the improved structure of the shadowless cover according to item 1 of the patent application scope, wherein the rear side of the fixed tube into which the intermediate tube is introduced between the frame of the shadowless cover is kept in conflict with a rear umbrella-clamping unit and the azimuth restriction is carried out by the screw fixing element In order to facilitate the displacement of the front rib clamping unit on the side of the aforementioned moving tube in the front-rear direction, it can form a desired opening/closing with the rear rib clamping unit here. According to the improved structure of the shadowless cover according to item 1 of the patent application scope, the shadowless cover frame is individually restricted to the partition on the back side of the moving tube, and is clamped with the front and rear umbrella bones on the back side of the fixed tube The unit is composed of two corresponding shapes of clamping blocks. Constituted by a connecting piece; wherein, the corresponding periphery of the two clamping blocks is a resisting section that maintains a plurality of intervals, and an inward area of the adjacent two resisting sections is recessed into an area to allow one end of the aforementioned connecting piece to extend the convex portion It is introduced and covered by the orientation, and then the corresponding two clamping blocks are integrated into an integrated position by the screw fixing element, so that each connecting piece around the introduction periphery can be resisted with the umbrella bone in a moderate orientation. According to the improved structure of the shadowless cover according to item 1 of the patent application scope, wherein the fixed tube position of the shadowless cover frame incorporated into the intermediate tube is at the front end against a bearing member, and the azimuth restriction is carried out by the screw fixing element. The recess on one side of the receiving member is to hold a hole to allow the movable introduction/retraction of a knob, and the rod section of the knob at the end of the knob introduced into the recess of the receiving member can be fitted with a positioning member so as to be limited to the inner periphery of the aforementioned hole, When a cover is fitted on the outer periphery of the positioning member, the middle tube adjacent to the inner part of the knob can be pressed against the inner part when the knob is introduced to the limit, or it can be pressed against the concave part of the receiving part as the end is combined as one end The middle tube of the luminaire needs to be displaced when the knob is withdrawn to drive the cover at the other end to maintain a distance from the middle tube, and the middle tube can be adjusted appropriately for advance and retreat, and the knob can be introduced exactly Orientation restrictions. According to the improved structure of the shadowless cover according to item 1 of the patent application scope, the front and rear ends of the middle tube between which the skeleton of the shadowless cover is sleeved inside the fixed tube are individually combined with a screw joint to facilitate the screw joint at the rear end Can be combined with the positioning of lamps.

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