JP7756902B2 - projection device - Google Patents

Description

The present invention relates to a projection device.

Conventionally, as an effect device for gaming machines, for example, a projection device that changes the image projected onto a transmissive screen with a simple configuration has been known, which includes a projection LED board, a film sheet with a pattern, and a diffusion lens plate arranged in that order, and projects the pattern on the film sheet onto the projection surface of a transmissive screen member (see Patent Document 1 below). Despite its simple configuration, this type of projection device is capable of projecting a pattern (image) onto the projection surface of a transmissive screen. By forming multiple different patterns on the film sheet and providing multiple light-emitting elements corresponding to each of multiple pieces of identification information, it is possible to selectively illuminate the patterns by selecting the light-emitting element to emit light. This allows a variety of patterns to be displayed on the screen member, and the projected patterns to be easily changed.

The same patent document discloses the use of reversal film (also known as color reversal film) as a film sheet on which multiple (e.g., nine) designs are provided.

Japanese Patent Application Laid-Open No. 2017-209369

However, when reversal film is used, there is a problem in that due to its low light resistance, the images printed on the reversal film will fade if exposed to light for a long time, and the clarity of the images projected onto a projection surface such as a screen will easily decrease. When the clarity of the images decreases, it reduces the interest of players and directly leads to a decrease in the functionality of the presentation device. Furthermore, replacing deteriorated reversal film or the entire projection device increases the effort and cost.

It is also known to use silk screen printing instead of reversal film. Silk screen printing has the advantage of being more light-resistant than reversal film, making it less likely to deteriorate when exposed to light and lasting longer.

However, when constructing a projection device with silk-screened parts, it is difficult to achieve uniform quality because silk-screen printing is generally done by hand, and the quality depends on the fineness of the mesh used for printing, which lacks fineness. Furthermore, foreign matter can sometimes be mixed in during the silk-screen printing process, causing problems such as the foreign matter itself being reflected on the projection surface, and making it difficult to remove the foreign matter.

This issue is not limited to projection devices used in performance devices for gaming machines, but is also common to projection devices used for other purposes.

The present invention was developed with these points in mind, and its main purpose is to provide a projection device that is resistant to deterioration of patterns (images) even when exposed to light, avoids the introduction of foreign matter during the manufacturing process, can project high-definition patterns (images), and can prevent or suppress the occurrence of defects.

[0009] In other words, the present invention is a projection device capable of projecting an image drawn on a design sheet onto a projection surface, comprising: a substrate mounted with a plurality of LED light sources; a design sheet on which images are drawn in positions corresponding to each of the LED light sources; a condenser lens unit disposed between the substrate and the design sheet and having a plurality of condenser lenses corresponding to each of the LED light sources and each of the images; a light-shielding member disposed between the substrate and the condenser lens unit and having a plurality of openings corresponding to each of the LED light sources and each of the images and restricting the passage of light emitted from each of the LED light sources to the corresponding openings; and an imaging lens unit disposed closer to the projection surface than the design sheet and having a plurality of imaging lenses corresponding to each of the LED light sources and each of the images, wherein the design sheet is a photomask film on which each image is formed in a plurality of image drawing areas corresponding to the LED light sources. Here, the "projection surface" in this invention may be a projection surface constituted by dedicated parts such as a screen, or may be a non-dedicated wall surface or board surface (such as a whiteboard). The supply of electricity to the LED light source, the ON/OFF or selective switching of the LED light source to be lit, and the change of the switching speed can be controlled by providing a power supply or controller within the projection device of the present invention, or by the power supply or controller of the gaming machine or the like in which the projection device is installed.

The inventors focused on the unique advantages of photomask film, which allows for precise drawing using laser light, and based on the previously unimagined technical idea of applying photomask film, which is generally used for screen printing (for exposure), patterns on substrates etc. (for etching photoresist exposure), solder resist on substrates (for photoresist exposure), various electrodes etc. (for photoresist exposure), to the design sheet of a projection device, they have achieved a projection device that exhibits various effects that could not be achieved with conventional reversal film or silk printing. In other words, with the projection device of the present invention, a photomask film with higher light resistance than reversal film is used as the design sheet, so deterioration of the design can be effectively prevented or suppressed even when exposed to light. Furthermore, photomask film has fewer defects than silk screen printing, so the problem of foreign matter being mixed in during the printing process that occurs when silk screen printing is used is avoided. When the LED light source is turned on, the light emitted from the LED light source is concentrated by a condenser lens and irradiated onto the photomask film, which is the design sheet. The light passes through the photomask film and is projected onto the projection surface by an imaging lens, thereby clearly projecting a high-resolution image drawn on the photomask film, thereby realizing a clear and highly visible display device. Although images that can be drawn on the photomask film are limited to monochrome, by changing the color of the LED light source, a single image can be projected to create different atmospheres.

Furthermore, in the projection device of the present invention, a design sheet is used in which images are formed in multiple image drawing areas, and by setting the mounting position of each LED light source on the board to multiple positions corresponding to the image drawing area, the image to be projected on the projection surface can be easily switched by appropriately selecting whether to turn the LED light source on or off.For example, by turning on two LED light sources at the same time, it becomes possible to project multiple images superimposed on the projection surface, and by appropriately selecting the image to be irradiated, the display variety can be increased.

Furthermore, a light-blocking member is disposed between the substrate and the condenser lens, and this light-blocking member has openings at positions corresponding to each light source and each image, so that the passage path of the light emitted from the LED light source can be limited to the openings, and the light emitted from the LED light source can be irradiated only onto the corresponding image and efficiently condensed by the condenser lens. This makes it possible to avoid the problem of light emitted from one LED light source irradiating images other than the corresponding image (for example, an adjacent image), resulting in unintended overlapping of projected images.

The light source used in the present invention may be a light-emitting diode (LED), particularly a chip-type LED.

If the projection device according to the present invention is equipped with a case having a light-blocking cylindrical case body capable of housing an optical system unit, which is composed of at least a substrate, a light-blocking member, a focusing lens section, a design sheet, and an imaging lens section arranged in that order, it is possible to efficiently prevent external light and dust from entering the interior of the projection device (inside the case body). Furthermore, projection devices can be mass-produced with each part pre-fixed to the case body, and prepared for installation in gaming machines, etc.

Furthermore, if the case is equipped with a rear cover attached to the side of the board on the case body opposite the light source, it can further improve the effectiveness of preventing ambient light and dust from entering the inside of the projection device (inside the case body).

Furthermore, if the case is fitted with a projection screen that focuses an image on a position on the case body that is further from the imaging lens unit when viewed from the substrate, the projection device of the present invention can complete the image projection on its own without the need for a separate screen to project onto, thereby increasing the flexibility of installation in gaming machines and other machines to which the projection device is applied.

When a white LED is used as the light source, the projected image is limited to black and white (monochrome), but when a full-color LED is used, a wide variety of full-color projection expressions can be realized. Whether the image is monochrome or full-color, the present invention, which applies a photomask film to the design sheet, can continue to project clearer images with greater durability than projection devices that use conventional reversal film or screen-printed design sheets.

As described above, this invention is based on the novel and useful technical idea of using a photomask film as a design sheet, making it possible to realize a projection device that is clearer and more light-resistant than previous projection devices, and to provide a projection device that prevents unintended overlapping of projected images and allows for high-definition projection display.

1 is an overall perspective view of a projection device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the device according to the embodiment. FIG. 2 is a perspective view of an optical system unit in the embodiment. FIG. 2 is a plan view of an optical system unit in the embodiment. 5 is a cross-sectional view taken along line aa in FIG. 4; An example of a design sheet and an example of a pattern on a projection surface in the same embodiment

One embodiment of the present invention will be described below with reference to the drawings.

As shown in Figures 1 and 2, the projection device X of this embodiment is a device capable of projecting an image 33 drawn on a design sheet 3 onto a projection surface (projection screen 63), and includes a substrate 2 on which a light source 1 is mounted, a design sheet 3 on which an image 33 is drawn in a position corresponding to the light source 1, a condensing lens unit 4 positioned between the substrate 2 and the design sheet 3, and an imaging lens unit 5 positioned closer to the projection surface than the design sheet 3.

The substrate 2 is, for example, disk-shaped, with the light source 1 mounted in the center, and multiple light sources 1 (a total of eight light sources 1 in the illustrated example) mounted at a predetermined pitch on an imaginary circle centered around the light source 1, for a total of nine light sources 1. White or full-color light sources 1 (chip-type LEDs) are appropriately selected and mounted on the substrate 2. The light emission color can be appropriately selected depending on the mounting location of the light source 1 and the content of the image 33 illuminated by the light source 1. The power supply and controller connected to the substrate 2 may be dedicated to the projection device X, or may be shared with other equipment in which the projection device X is incorporated.

The design sheet 3 is a sheet body 31 shaped to correspond to the substrate 2, with multiple image drawing areas 32 defined therein, and an image 33 drawn in each image drawing area 32. Each image drawing area 32, set to correspond to the mounting position of the light source 1, has a different image 33 drawn in it. In this embodiment, a photomask film is used as the design sheet 3, and the image 33 is formed by drawing it with laser light. The photomask film is an optical mask used when exposing a photoresist, and is a black-and-white silver halide film made of a PET base. The photomask film can draw the image 33 with laser light in an environment maintained at a constant temperature and humidity. It can achieve extremely high resolution specifications, with a maximum resolution of 254,000 to 240,000 dpi (laser spot diameter of approximately 0.004 mm), allowing the image 33 to be expressed with approximately 20 times the fineness (density) of the standard resolution of typical monochrome printing (approximately 1,200 dpi). In this way, graphics drawn on the photomask film can be expressed beautifully and with high precision.

The condenser lens unit 4 has small lenses 41 (used as condenser lenses 41) mounted on a common plate body 42 at positions corresponding to the light sources 1. The condenser lens unit 4 of this embodiment has nine condenser lenses 41 and is entirely transparent.

The imaging lens unit 5 has multiple imaging lenses 52 (used as imaging lenses 52) mounted on a common plate body 51. Specifically, imaging lenses 52 are provided at positions on the plate body 51 that correspond to the image drawing area 32. The imaging lens unit 5 of this embodiment has nine imaging lenses 52 and is entirely transparent.

In this embodiment, the projection device X has a substrate 2, a design sheet 3, a condensing lens unit 4, and an imaging lens unit 5 fixed within a shared case 6.

The case 6 comprises a cylindrical (cylindrical in this embodiment) case body 61 and a back cover 62 attached to the bottom of the case body 61 with fasteners such as screws. A projection screen 63 is provided on the lid of the case body 61. Both the case body 61 and the back cover 62 are painted black after molding to provide a light-blocking function and prevent dust from entering the case 6 from the outside and ambient light from entering the case 6. In the following description, the direction toward the back cover 62 in the longitudinal direction (axial direction A) of the case 6 is referred to as the down direction, and the direction toward the projection screen 63 is referred to as the up direction. As will be described later, the projection device X according to this embodiment is configured so that the optical system unit U (an optical system unit based on the back cover 62) shown in Figures 3 to 5 can be attached to the case body 61.

In the projection device X of this embodiment, a recess 621 capable of accommodating the substrate 2 is provided in the rear cover 62 within the internal space of the case body 61. The substrate 2 is placed in this recess 621 with the irradiation direction L of the light source 1 facing the projection screen 63, and a light-shielding cover 7 is positioned to cover the substrate 2 from above.

The light-shielding cover 7 is a light-shielding member that is painted black after molding and has openings (incident holes 71) at positions corresponding to the light sources 1. The incident holes 71 are holes of a predetermined size that face each LED light source 1, and light emitted from each LED light source 1 passes through the corresponding incident hole 71. The portions of the light-shielding cover 7 excluding the incident holes 71 block light incident from the LED light sources 1. The light-shielding cover 7 integrally comprises a disk-shaped light-shielding cover main body 72 having multiple incident holes 71 and a cylindrical light-shielding cover side wall 73 that hangs down from the outer edge of the light-shielding cover main body 72. When the light-shielding cover 7 is positioned with the lower end of the light-shielding cover side wall 73 in contact with the rear cover 62, the light-shielding cover main body 72 and the substrate 2 face each other at a predetermined distance, and the incident hole 71 is positioned directly above the light source 1 (see Figure 5). When the condenser lens unit 4 is placed in a position that covers the light-shielding cover 7 from above, the condenser lenses 41 of the condenser lens unit 4 fit into each of the entrance holes 71 of the light-shielding cover 7.

The condenser lens unit 4 of this embodiment integrally comprises a disc-shaped plate body 42 having a condenser lens 41 and a cylindrical condenser lens side wall 43 that hangs downward from the outer edge of the plate body 42. The inner diameter of the condenser lens side wall 43 is set to a value slightly larger than the outer diameter of the light-shielding cover side wall 73. When the condenser lens unit 4 is positioned with the lower end of the condenser lens side wall 43 in contact with the rear cover 62, the condenser lenses 41 of the condenser lens unit 4 are fitted into the entrance holes 71 of the light-shielding cover 7 as described above, and the light-shielding cover side wall 73 is positioned on the inner periphery of the condenser lens side wall 43 (see Figure 5).

In this embodiment, the projection device X has a light-blocking case 8 positioned to cover the design sheet 3 from above. The light-blocking case 8 is a light-blocking member that is painted black after molding and has openings (incident holes 81) at positions corresponding to the light sources 1. The incident holes 81 are the same size as the incident holes 71 in the light-blocking cover 7, and light that passes through the image drawing area 32 of the design sheet 3 passes through the corresponding incident holes 81. In this embodiment, the incident holes 81 are recessed holes whose opening diameter gradually increases upward. The portions of the light-blocking case 8 excluding the incident holes 81 block light that passes through the image drawing area 32 of the design sheet 3. The light-blocking case 8 is integrally composed of a disk-shaped light-blocking case main body 82 having the incident holes 81 and cylindrical light-blocking case side walls 83 that extend downward and upward from the outer edge of the light-blocking case main body 82. The light-shielding case side wall 83 has a large-diameter portion 831 whose inner diameter is slightly larger than the outer diameter of the condenser lens side wall 43 and a small-diameter portion 832 whose inner diameter is approximately the same as the outer diameter of the light-shielding cover side wall 73, with a step 833 formed at the boundary between the large-diameter portion 831 and the small-diameter portion 832. When the light-shielding cover 7 is placed with the lower end of the light-shielding case side wall 83 (the lower end of the large-diameter portion 831) in contact with the rear cover 62, the condenser lens 41 of the condenser lens unit 4 and the image drawing area 32 of the design sheet 3 face from below into the entrance hole 81 of the light-shielding case 8, and the condenser lens side wall 43 is positioned on the inner periphery of the large-diameter portion 831 (see FIG. 5 ). Furthermore, the design sheet 3 is sandwiched between the step 833 of the light-shielding case side wall 83 and the outer edge of the upward-facing surface of the condenser lens main body 42, allowing the design sheet 3 to be held in a stable position. The design sheet 3 faces the light-shielding case main body 82 at a predetermined distance. The rear cover 62 also has a ring-shaped protrusion 623 that covers the outer periphery of the lower end of the light-shielding case side wall 83 (the lower end of the large diameter portion 831). By positioning the lower end of the light-shielding case side wall 83 (the lower end of the large diameter portion 831) on the inner periphery of this protrusion 623, the light-shielding case 8 can be properly positioned relative to the rear cover 62 (see Figures 3 and 5).

In the projection device X of this embodiment, the imaging lens unit 5 is placed in the light-tight case 8 with the outer edge of the imaging lens unit 5 supported by the upper end of the light-tight case side wall 83, and the lens cover 9 is positioned to cover the imaging lens unit 5 from above. The imaging lens unit 5 faces the light-tight case main body 82 at a predetermined distance, and is positioned so that the imaging lens 52 faces the entrance hole 81 of the light-tight case 8 (see Figure 5).

The lens cover 9 is painted black after molding, and has an entrance hole 91 that allows light to pass through depending on the position of the light source 1. In this embodiment, the entrance hole 91 is a countersunk hole whose opening diameter gradually increases upward. The lens cover 9 is integrally composed of a disk-shaped lens cover main body 92 having the entrance hole 91 and a cylindrical lens cover side wall 93 that hangs down from the outer edge of the lens cover main body 92. When the lens cover 9 is positioned so that the lower end of the lens cover side wall 93 is in contact with the step 833 of the light-shielding case 8, the lens cover main body 92 and the imaging lens unit 5 come into contact with or are close to each other, and the entrance hole 91 is positioned directly above the imaging lens 52 of the imaging lens unit 5 (see Figure 5). In this embodiment, as shown in FIGS. 2 to 5 , the lens cover 9 includes a protrusion 94 that protrudes laterally from a predetermined position on the lens cover side wall 93 and has a screw hole 95. The back cover 62 includes a columnar screw receiver 622 at a position corresponding to the protrusion 94. With the protrusion 94 in contact with the upper end of the screw receiver 622, a tapping screw N1 is inserted from above into the screw hole 95 of the protrusion 94 and threaded into the screw receiver 622. This allows the substrate 2, light-shielding cover 7, condensing lens unit 4, design sheet 3, light-shielding case 8, and imaging lens unit 5 to be arranged in this order between the back cover 62 and the lens cover 9, and the optical system unit U can be handled as a fixed arrangement maintaining their normal positions (i.e., the light source 1, incident hole 71, condensing lens 41, image drawing area 32, incident hole 81, imaging lens 52, and incident hole 91 are all aligned).

In this embodiment, the projection device X can be treated as a projection unit containing the substrate 2, light-shielding cover 7, condenser lens unit 4, design sheet 3, light-shielding case 8, imaging lens unit 5, and lens cover 9 within the interior space of the case 6 by fixing the optical system unit U to the case body 61 with fasteners such as tapping screws N2. In this embodiment, the lower end region of the interior space of the case body 61, which serves as the housing space for the optical system unit U, is configured as a rectangular space in cross section, while the region above the lower end region is configured as a funnel-shaped space with an opening cross-sectional area that gradually increases upward. Therefore, the thickness of the lower end of the case body 61 is thicker than the upper end. In this embodiment, a screw receiving portion (not shown) is provided at the bottom end of the case body 61, and the rear cover 62 and, ultimately, the optical system unit U can be integrally assembled to the case body 61 by threading a tapping screw N2 inserted into a screw insertion hole 626 formed in a tongue piece 625 of the rear cover 62 into the screw receiving portion.

The projection device X of this embodiment, which has the above configuration, is a device that has an optical system unit U built into the case 6, and each image 33 drawn in each image drawing area 32 of the design sheet 3 is arranged opposite each LED light source 1 in a one-to-one relationship.By illuminating the LED light source 1 of the image 33 to be projected, the image 33 can be projected and displayed on the projection screen 63.

In other words, the light emitted from the LED light source 1 is efficiently collected by one of the small lenses 41 in the condenser lens unit 4, passes through the corresponding image drawing area 32 on the design sheet 3, and is focused onto the projection screen 63 by the imaging lens unit 5, displaying a projected image of the image 33 drawn in the image drawing area 32. The optical design allows the projected image of each image 33 to be projected onto the center of the projection screen 63.

Therefore, in the projection device X (projection unit) according to this embodiment, when the LED light source 1 is turned on by supplying power to the terminals (not shown) of the board 2, the light emitted from this LED light source 1 is incident on the condenser lens section 4 (condenser lens 41), which then condenses the light from the LED light source 1. The condensed light enters the image drawing area 32 of the photomask film, which is the design sheet 3, passes through the image drawing area 32, and reaches the imaging lens 52, which then transmits the light from the photomask film, allowing the image 33, such as a picture, figure, or text drawn in the image drawing area 32, to be formed on the projection screen 63. As a result, the image 33 drawn on the photomask film with laser light is displayed on the projection screen 63 as a greatly enlarged projected image. For example, if the nine images 33 shown in Figure 6(a) are drawn in the nine image drawing areas 32 of the photomask film, to project and display the selected image 33, the word "ASIC," the LED light source 1 corresponding to the image drawing area 32 where the word "ASIC" is drawn is turned on. Light from the LED light source 1 is then incident on the condenser lens unit 4 and condensed, and the bundled light exits one condenser lens 41 and enters the image drawing area 32 where the word "ASIC" is drawn. The light passes through the image drawing area 32 and enters the imaging lens unit 5, and one imaging lens 52 transmits the light from the image drawing area 32, causing the black word "ASIC" to be enlarged and displayed as a projected image on the projection screen 63.

The projection device X (projection unit) of this embodiment focuses on the unique advantages of photomask film, which can achieve image formation through fine drawing with laser light, and uses photomask film, which is used for screen printing (for exposure), patterns on substrates etc. (for etching photoresist exposure), solder resist on substrates (for photoresist exposure), various electrodes etc. (for photoresist exposure), as the design sheet 3. As a result, it is more light-resistant than reversal film and can prevent or suppress deterioration of the pattern over the long term even when exposed to light. Furthermore, photomask film has fewer defects than silk printing, and can avoid the problem of foreign matter being mixed in during the printing process that occurs when silk printing is used. It can clearly project high-definition images formed on the photomask film and function as a clear, highly visible display device.

Thus, the projection device X of this embodiment is based on the hitherto unconceived technical idea of using a photomask film on which an image 33 is formed by drawing with laser light as the design sheet 3, and exhibits the above-mentioned effects that could not be achieved with conventional reversal film or silk printing.Furthermore, photomask film has the advantage of being easily available because it is used in the semiconductor industry, and can be used as a projection device that is highly productive and highly practical and versatile.

In particular, with the projection device X according to this embodiment, multiple image drawing areas 32 are set on the photomask film, which is the design sheet 3, and an image 33 is drawn in each image drawing area 32 with laser light. Furthermore, the mounting positions of the LED light sources 1 on the substrate 2 are set to multiple positions corresponding to the image drawing areas 32. Therefore, by appropriately turning the LED light sources 1 on and off, it is possible to easily switch between images 33 projected and displayed on the projection surface (projection screen 63). Furthermore, with the projection device X according to this embodiment, it is also possible to simultaneously project multiple images 33 (two images 33 in the illustrated example) superimposed on the projection surface (projection screen 63), as shown in FIG. 6(b), for example. By appropriately selecting the image 33 to be illuminated by the LED light source 1, it is possible to increase the display variation, and switch between displaying at least one image 33 without using a large-scale device such as an LCD display device or projector.

In addition, with the projection device X according to this embodiment, a light-blocking cover 7, which is a light-blocking member, is disposed between the substrate 2 and the condenser lens unit 4. The light-blocking cover 7 has an opening (incident hole 71) at a position corresponding to the light source 1, and limits the path of light emitted from the light source 1 to the opening (incident hole 71). As a result, the light emitted from the light source 1 mounted on the substrate 2 can be efficiently focused by the small lenses 41 of the condenser lens unit 4.

In addition, the projection device X according to this embodiment includes a case 6 capable of housing an optical system unit U, which is made up of at least a substrate 2, a light-shielding cover 7, a condensing lens unit 4, a design sheet 3, and an imaging lens unit 5 arranged in this order, within its internal space. The case 6 includes a cylindrical, light-shielding case body 61 and a projection screen 63 provided at a predetermined location on the case body 61 (a location that seals the opening of the case body 61). Therefore, by housing the optical system unit U in the case body 61, adverse effects on the optical system unit U caused by external light entering the inside of the case 6 can be avoided, and the projection device X can be used as a projection unit capable of projecting and displaying an image 33 on the projection screen 63.

In this way, the projection device X of this embodiment is equipped with a chip-type LED light source 1 that emits a large amount of light, yet is able to achieve a compact unit size and high-definition projected images. Even when placed in a narrow space within a gaming machine as an effect device for the gaming machine, it is able to project and form a high-definition, clear image 33 onto the projection screen 63, which serves as the projection surface, enabling a variety of light-emitting display forms that are rich in gameplay.

The present invention is not limited to the above-described embodiment. For example, the number and positions of images drawn on the photomask film used as a design sheet (number of image drawing areas) can be changed as appropriate, as long as at least two images are drawn. Depending on the number of images drawn on the photomask film (number of image drawing areas), the number and positions of light sources mounted on the substrate, and the shapes of the condenser lens and imaging lens (number and positions of small lenses) can also be set and changed as appropriate.

The image drawing area can be set to any suitable shape other than circular (e.g., rectangular), and similarly, the overall shape of the design sheet or circuit board can be set to any suitable shape other than circular (e.g., rectangular).

This invention also includes projection devices that do not have a light-blocking member (light-blocking cover, light-blocking case), projection devices that do not have an optical system unit built into the case, and projection devices that do not have a case.

Alternatively, the projection device may have a built-in controller. In this case, a button cell or a small battery can be used as the power source, making it possible to make the projection device have a built-in power source.
The present invention also includes projection devices that cannot be handled as a unit, and projection devices that do not have a dedicated projection screen but instead use an existing wall or board surface as a projection surface and project an image onto that projection surface.

Projection devices based on the technical concept of this invention are not limited to projection devices used in performance devices for gaming machines, but can also be used for other purposes.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

1... light source 2... substrate 3... design sheet 32... image drawing area 4... condenser lens section 41... condenser lens (small lens)
5...imaging lens section 52...imaging lens (small lens)
6...Case 61...Case body 62...Rear cover 63...Projection surface (projection screen)
7...Light-shielding member (light-shielding cover)
71...Opening (irradiation hole)
U: optical system unit X: projection device

Claims (5)

A projection device capable of projecting an image drawn on a design sheet onto a projection surface,
a substrate on which a plurality of LED light sources are mounted;
a design sheet on which an image is drawn at a position corresponding to each of the LED light sources;
a condenser lens unit disposed between the substrate and the design sheet and having a plurality of condenser lenses provided corresponding to each of the LED light sources and each of the images;
a light-blocking member disposed between the substrate and the condenser lens unit, the light-blocking member having a plurality of openings corresponding to the LED light sources and the images, the light-blocking member limiting the passage of light emitted from the LED light sources to the corresponding openings;
an imaging lens unit that is disposed at a position closer to the projection surface than the design sheet and has a plurality of imaging lenses that are provided corresponding to each of the LED light sources and each of the images;
A projection device characterized in that the design sheet is a photomask film on which the images are formed in a plurality of image drawing areas that are positions corresponding to the LED light sources. The projection device according to claim 1, further comprising a case having a light-shielding cylindrical case body capable of accommodating an optical system unit having at least the substrate, the light-shielding member, the focusing lens section, the design sheet, and the imaging lens section arranged in this order within its internal space. 3. The projection device according to claim 2, wherein the case has a rear cover attached to the case body on the side of the board opposite to the LED light source. A projection device as described in either claim 2 or 3, wherein the case is fitted with a projection screen that focuses the image on a side of the case body that is distal to the imaging lens unit when viewed from the substrate. 5. The projection device according to claim 1, wherein the LED light source is a white LED or a full-color LED.