RU220094U1 - Projector - Google Patents

Abstract

The utility model relates to the field of displaying multimedia information. The projector (1) contains a housing in which a projection unit (2), a server unit (3) and a switching unit (4) are interconnected. The increase in the protection of the projector and the content contained in it is achieved by the fact that the housing contains a protection unit (5), which is a microboard with a connected magnetic sensor for opening and a light sensor based on a photodiode, while the magnetic sensor is configured to respond to a mechanical break in the circuit wherein the light sensor is configured to respond to changes in illumination within the projector body; the server unit (3) is equipped with a temporary storage of encrypted content, while the server unit is configured to decrypt the content during its broadcast. 1 ill.

Description

Technical field

The claimed technical solution relates to the field of displaying multimedia information and is intended for cinematography of rural clubs, cultural centers, secondary educational schools and military units on the territory of the Russian Federation.

State of the art

Known are household and office multimedia projectors, as well as digital projectors that support the DCI standard for film display. The disadvantage of the DCI standard is the lack of its own digital platform for content and session management. Household and office multimedia projectors do not have a built-in server protected from unauthorized access and a hard drive for temporary storage of films and other content intended for demonstration on a large screen (up to 10 m wide) in high quality (2K or 4K).

A projection system was chosen as a prototype (US9262644B2 "Server, recording medium, and image display system" (NAGAI KOHTA [JP]; MATSUSHIMA HIROYUKI [JP]; UCHIYAMA DAIGO [JP]; RICOH CO LTD [JP], G06F21 / 62, G06F21 /31, G06F21/33, G06F21/44, G06F21/84, published on 01/16/2014, [1].) As in the claimed technical solution, the projection system includes a projection server, a storage server and a projector. The communication interface connects the projection server to the network.

Also analogue [1] includes an external web service server, an image input and output device, a firewall, a router and networks.

The projection server communicates with the external web service server, storage server, image input/output device, and projector via a communication interface.

The technical problem to be solved is the need to increase the protection of the device.

The disadvantage of the prototype [1] is the low protection of content from unauthorized use. At the same time, it is not known how the device is protected from opening.

Disclosure of the proposed technical solution

The technical result provided by the claimed technical solution is to increase the protection of the projector and the content contained in it.

The essence of the claimed technical solution lies in the fact that the projector contains a housing in which a projection unit, a server unit and a switching unit are interconnected. It differs in that

in the housing there is a protection unit, which is a microboard with a connected magnetic sensor for opening and a light sensor based on a photodiode, while the magnetic sensor is configured to respond to a mechanical break in the circuit, and the light sensor is configured to respond to a change in lighting inside the projector housing;

the server unit is equipped with a temporary storage of encrypted content, while the server unit is configured to decrypt the content during its broadcast.

The above entity is a set of essential features of the claimed technical solution, ensuring the achievement of the claimed technical result.

In a particular case, the protection unit is a microboard with a processor and memory based on an ATmega microcontroller, while two Powermix 18650 Li-Ion batteries with a capacity of 3400 mAh are also connected to the mentioned microboard.

The case mainly contains one IEC C14 power connector, two RJ45 Ethernet connectors for connecting to the Internet and audio output.

The authors of the claimed technical solution produced a prototype of this solution, the tests of which confirmed the achievement of the technical result.

Brief description of the drawings.

The figure shows the projector circuit (top view).

List of reference designations:

1 - projector;

2 - projection block;

3 - server block;

4 - switching block;

5 - protection block.

Implementation of a technical solution.

The film projector contains a single housing (1) made of metal.

The case (1) is made smooth and does not contain connectors traditional for multimedia projectors for connecting to video signal sources, such as VGA, DVI, S VIDEO, HDMI and others.

The case mainly contains one IEC C14 power connector, two RJ45 Ethernet connectors for connecting to the Internet and audio output.

The projector contains four functional blocks: projection block (2), server block (3), switching block (4) and protection block (5).

The projection unit (2) contains components used in laser household and office multimedia projectors:

power unit;

laser light source with a resource of 20000-40000 hours,

3LCD or DLP matrix,

optical module (lens).

The server block (3) consists of a microcomputer based on an intel Core i5 or more processor with at least 8GB DDR4 RAM and is equipped with an SSD drive with a memory capacity of at least 256Gb that acts as a temporary storage of encrypted content. At the same time, the server block (3) is configured to decrypt the content during its broadcast. In this case, after receiving a signal to start the movie, the program sends a request protected from spoofing to the platform server to check permission to start. After obtaining permission, the process of segmented decryption of the file takes place, after which the decrypted video stream is transferred to the video player.

The switching unit (4) contains wires, connectors for audio signal transceivers over twisted pair, and a power supply unit. The switching unit (4) performs switching of the device blocks.

The protection unit (5) provides protection against opening the housing (1) and contains sensors that are designed to respond to a mechanical break in the circuit and a change in lighting inside the projector housing. In this case, the protection unit is a microplate with a connected magnetic opening sensor and a light sensor based on a photodiode.

The magnetic sensor consists of a reed switch closed in a plastic housing and a magnet, while the magnet is placed in a separate second housing. The reed switch is fixed on one side of the body, and the magnet on the other. When the doors are closed, the sensor contacts are closed, when the doors open, the sensor contacts open.

The amount of illumination at which the photodiode-based light sensor is triggered is regulated by a variable resistor on the board. Unlike modules based on photoresistors, this module can distinguish between a directional light source.

A control panel (not shown) is installed on an external personal computer to control the projector.

This set and arrangement of blocks in the projector is new and simultaneously solves the following tasks:

film screening of films on a wide screen in high quality playback;

content management and film screening sessions on a digital platform;

protecting content from unauthorized use and copyright infringement;

playback of content in conditions of low Internet speed and the inability to use streaming services directly.

Description of work.

Unlike multimedia projectors, the inventive projector is capable of reproducing content received from its own digital platform, encrypted in its own format. In this case, the source files are encrypted with a modified AES symmetric block cipher and saved in a file with the extension extra. DCI-compliant cinema projectors do not work through a single digital platform, and third-party entities and systems handle encryption and delivery of content.

When the security block sensor (5) is triggered, the software is blocked, which makes it impossible to steal, intercept the content stored inside the projector. The system has a background service independent of the main program, which monitors the presence and state of the internal memory of the chip with sensors. When the fact of opening is detected, some part of it is removed from the software, which leads to the inoperability of the server block (3). A tamper signal is sent to the server unit (3), the background image on the projector is changed to black and white. The control panel is blocked and information is displayed about the blocking of the equipment and a suggestion to contact technical support.

Since the content is encrypted and decrypted by the server unit (3) only when it is broadcast to the screen, there is no interception of the content while it is being transmitted to the projector via the Internet connection.

The claimed projector works exclusively with its software, while the content is obtained from the library. Unlike online cinemas and streaming services, encrypted films are downloaded to the projector for temporary storage and played after scheduling shows and selling tickets. After all scheduled sessions have ended, the encrypted copy of the movie is deleted from the projector's temporary storage.

The operation of the projector exclusively with its own platform makes it possible to consider the projector as a single software and hardware complex with high film display quality.

Claims (2)

1. A projector containing a housing in which a projection unit, a server unit and a switching unit are interconnected, characterized in that the protection unit (5) is located in the housing, which is a microboard with a connected magnetic opening sensor and a light sensor based on a photodiode, wherein the magnetic sensor is configured to respond to a mechanical break in the circuit, wherein the light sensor is configured to respond to a change in illumination inside the projector case; the server unit is equipped with a temporary storage of encrypted content, while the server unit is configured to decrypt the content during its broadcast. 2. The projector according to claim 1, characterized in that the protection unit is a microboard with a processor and memory based on the ATmega microcontroller, while two batteries of the Powermix 18650 Li-Ion battery type with a capacity of 3400 mAh are connected to the mentioned microboard.