TRACEPRO TUTORIAL LED Requirements Models: None Properties: None Editions: TracePro LC, Standard and Expert Introduction In this example you will build a source model for a Siemens LWT676 surface mount LED based on the manufacturers data sheet. The dimensions will be used to build a solid model and the source output will be defined to match the LED photometric curve. Copyright 2013 Lambda Research Corporation. All Rights Reserved. www.lambdares.com LED www.lambdares.com Page 2 TRACEPRO TUTORIAL Create a Thin Sheet First analyze the package to determine the best method of constructing the geometry in TracePro. The symmetry of the package suggests starting from a Thin Sheet and extruding the top and bottom halves with a small draft angle. Construct Thin Sheet in the XY plane. 1. Start TracePro 2. Select View|Profiles|XY or click the View XY button on the toolbar, and switch to silhouette mode, View|Silhouette. 3. Select Insert|Primitive Solid and select the Thin Sheet tab. 4. Enter the four corners of the Thin Sheet in mm in the dialog box, as shown below, and click Insert. 5. Click the Zoom All button or select View|Zoom|All to see the new object. LED www.lambdares.com Page 3 TRACEPRO TUTORIAL Selecting a Surface TracePro uses surface and object selections for many operations. 1. Close the Insert Primitive Solid dialog box. The thin sheet object has only one surface. 2. Select View|Profiles|YZ or click the View YZ button on the toolbar to view the profile of the Thin Sheet. 3. Select the surface using by selecting Edit|Select|Surface (or clicking the Select Surface button), then use the mouse to “pick” the rod end, which is Surface 0 as shown in the figure below, After selecting the surface it will be highlighted in black in the model view. LED www.lambdares.com Page 4 TRACEPRO TUTORIAL Use Sweep to Form a Solid The package has a small angle of about 4 degrees so you will extrude the sheet using Edit|Surface|Sweep. 1. Select Edit|Surface|Sweep or right-click on the surface and select Sweep. 2. Enter a sweep distance of 0.9 mm and a draft angle of 4 degrees. 3. Click Apply. The surface will be swept along the planes surface normal, in this case along the Z axis. 4. Make sure Surface 4 is selected for the next sweep to complete the object. LED www.lambdares.com Page 5 TRACEPRO TUTORIAL Complete the Solid Perform two more sweep operations to complete the solid according to the data sheet. 1. Select Surface 4. 2. Sweep by 0.2 with draft=0 to create the central portion of the package. 3. Select Surface 8. 4. Sweep again by 0.9 with a 4 degree draft to complete the construction. LED www.lambdares.com Page 6 TRACEPRO TUTORIAL Create a Conical Hole Next you can add the cone reflector which holds the LED die. To create the conical hole, first create a cone, then perform a Boolean Subtract operation. 1. Select Insert|Primitive Solid and select the Cylinder/Cone tab. 2. Select the Cone option and enter the values shown, then click Insert to create the cone. LED www.lambdares.com Page 7 TRACEPRO TUTORIAL Subtract the Cone from the Package Boolean Operations use a concept of Body and Tools. The Body is the item you wish to keep and the tools are items which will have some effect on the Body. Here you want to remove the volume occupied by the cone from the package. In this example the Body is the package and the Tool is the cone. 1. Select the Package object from the System Tree by clicking on the Thin sheet 1 object. 2. Select the Cone 1 object from the System Tree using Ctrl+Click to add it to the selection. 3. Select Edit|Boolean|Subtract or use the Boolean Subtract button as shown in the figure. 4. Cone 1 will be removed from the System Tree as shown in the bottom figure with 15 surfaces shown in the Thin Sheet Object LED www.lambdares.com Page 8 TRACEPRO TUTORIAL Add a Diffuser You also need to add a diffuser. This will be a thin cylinder joined to the package. You will make the inner surface of the diffuser scattering and the inside of the cone a perfect mirror. 1. Select Insert|Primitive Solid, Cylinder/Cone tab. 2. Enter the values shown, Major Radius 1.2, Length .01 and Base Position 1.99. 3. Click Insert to create the cylinder. LED www.lambdares.com Page 9 TRACEPRO TUTORIAL Add the LED Now you will add the LED chip itself. The dimensions are not given, but you can estimate from the data sheet that it is 0.4 x 0.4 x 0.15 mm. 1. From the Insert|Primitive Solid dialog box, select the Block tab 2. Enter the values shown in the Block dialog shown below. Make sure you name the object by typing LED in the Name box 3. The center of the LED has a Z-value 1.175 to position the block so that it is on the bottom of the conical hole. 4. Click Insert to create the block. 5. The other 2 objects could have been named when they were created, but they can also be renamed at any time. Select each object in turn with 2 slow clicks to get the name in edit mode, then name them “Package”, and “Diffuser”. LED www.lambdar